Etymology
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*kad- 
Proto-Indo-European root meaning "to fall."

It forms all or part of: accident; cadaver; cadence; caducous; cascade; case (n.1); casual; casualty; casuist; casus belli; chance; cheat; chute (n.1); coincide; decadence; decay; deciduous; escheat; incident; occasion; occident; recidivist.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sad- "to fall down;" Latin casus "a chance, occasion, opportunity; accident, mishap," literally "a falling," cadere "to fall, sink, settle down, decline, perish;" Armenian chacnum "to fall, become low;" perhaps also Middle Irish casar "hail, lightning."
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swelter (v.)
c. 1400, "faint with heat," frequentative of swelten "be faint (especially with heat)," late 14c., from Old English sweltan "to die, perish," from Proto-Germanic *swiltan- (source also of Old Saxon sweltan "to die," Old Norse svelta "to put to death, starve," Gothic sviltan "to die"), perhaps originally "to burn slowly," hence "to be overcome with heat or fever," from PIE root *swel- (2) "to shine, beam" (see Selene). From the same ancient root comes Old English swelan "to burn." For specialization of words meaning "to die," compare starve. Related: Sweltered; sweltering.
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Pharisee (n.)

"member of an ancient Jewish sect (2c. B.C.E.-1c. C.E.) distinguished by strict observance but regarded as pretentious and self-righteous," at least by Jesus (Matthew xxiii.27), c. 1200, Pharise, from Old English Fariseos, Old French pharise (13c.), and directly from Late Latin Pharisæus, from Greek Pharisaios, from Aramaic (Semitic) perishayya, emphatic plural of perish "separated, separatist," corresponding to Hebrew parush, from parash "he separated." Extended meaning "any self-righteous person, formalist, hypocrite, scrupulous or ostentatious observer of the outward forms of religion without regard to its inward spirit" is attested from 1580s.

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non-perishable (adj.)

also nonperishable, "not subject to rapid decay or deterioration," 1887, from non- + perishable.

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*leu- 
Proto-Indo-European root meaning "to loosen, divide, cut apart."

It forms all or part of: absolute; absolution; absolve; analysis; analytic; catalysis; catalyst; catalytic; dialysis; dissolve; electrolysis; electrolyte; forlorn; Hippolytus; hydrolysis; -less; loess; loose; lorn; lose; loss; Lysander; lysergic; lysis; -lysis; lyso-; lysol; lytic; -lytic; palsy; paralysis; pyrolusite; resolute; resolution; resolve; soluble; solute; solution; solve; solvent.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit lunati "cuts, cuts off," lavitram "sickle;" Greek lyein "to loosen, untie, slacken," lysus "a loosening;" Latin luere "to loose, release, atone for, expiate;" Old Norse lauss "loose, free, unencumbered; vacant; dissolute;" Old English losian "be lost, perish."
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fugitive (adj.)

late 14c., "fleeing, having fled, having taken flight," from Old French fugitif, fuitif "absent, missing," from Latin fugitivus "fleeing," past-participle adjective from stem of fugere "to flee, fly, take flight, run away; become a fugitive, leave the country, go into exile; pass quickly; vanish, disappear, perish; avoid, shun; escape the notice of, be unknown to," from PIE root *bheug- "to flee" (source also of Greek pheugein "to flee, escape, go into exile, be on the run," phyza "(wild) flight, panic," phyge "flight, exile;" Lithuanian būgstu, būgti "be frightened," bauginti "frighten someone," baugus "timid, nervous;" perhaps also Avestan būj(i)- "penance, atonement," būjat "frees"). Old English had flyma.

Meaning "lasting but a short time, fleeting" is from c. 1500. Hence its use in literature for short compositions written for passing occasions or purposes (1766).

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freeze (v.)
alteration of freese, friese, from Middle English fresen, from Old English freosan (intransitive) "turn to ice" (class II strong verb; past tense freas, past participle froren), from Proto-Germanic *freusan "to freeze" (source also of Dutch vriezen, Old Norse frjosa, Old High German friosan, German frieren "to freeze," and related to Gothic frius "frost"), from Proto-Germanic *freus-, equivalent to PIE root *preus- "to freeze," also "to burn" (source also of Sanskrit prusva, Latin pruina "hoarfrost," Welsh rhew "frost," Sanskrit prustah "burnt," Albanian prus "burning coals," Latin pruna "a live coal").

Of weather, "be cold enough to freeze," 13c. Meaning "perish from cold" is c. 1300. Transitive sense "harden into ice, congeal as if by frost" first recorded late 14c.; figurative sense late 14c., "make hard or unfeeling." Intransitive meaning "become rigid or motionless" attested by 1720. Sense of "fix at a certain level" is from 1933; of assets, "make non-transactable," from 1922. Freeze frame is from 1960, originally "a briefly Frozen Shot after the Jingle to allow ample time for Change over at the end of a T.V. 'Commercial.' " ["ABC of Film & TV," 1960].
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deer (n.)

Old English deor "wild animal, beast, any wild quadruped," in early Middle English also used of ants and fish, from Proto-Germanic *deuzam, the general Germanic word for "animal" (as opposed to man), but often restricted to "wild animal" (source also of Old Frisian diar, Dutch dier, Old Norse dyr, Old High German tior, German Tier "animal," Gothic dius "wild animal," also see reindeer).

This is perhaps from PIE *dheusom "creature that breathes," from root *dheu- (1) "cloud, breath" (source also of Lithuanian dusti "gasp," dvėsti "gasp, perish;" Old Church Slavonic dychati "breathe"). For possible prehistoric sense development, compare Latin animal from anima "breath").

The sense specialization to a specific animal began in Old English (the usual Old English word for what we now call a deer was heorot; see hart), was common by 15c., and is now complete. It happened probably via hunting, deer being the favorite animal of the chase (compare Sanskrit mrga- "wild animal," used especially for "deer"). 

Deer-lick "salty spot where deer come to lick," is attested by 1778, in an American context. The deer-mouse (1840) is so called for its agility.

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bite (v.)

Old English bitan "to pierce or cut with the teeth" (class I strong verb; past tense bat, past participle biten), from Proto-Germanic *beitanan (source also of Old Saxon bitan, Old Norse and Old Frisian bita "cut, pierce, penetrate," Middle Dutch biten, Dutch bijten, German beissen, Gothic beitan "to bite"), from PIE root *bheid- "to split," with derivatives in Germanic referring to biting.

To bite the bullet is said to be 1700s military slang, from old medical custom of having the patient bite a lead bullet during an operation to divert attention from pain and reduce screaming. Figurative use from 1891; the custom itself attested from 1840s. To bite (one's) tongue "refrain from speaking" is 1590s; to bite (one's) lip to repress signs of some emotion or reaction is from early 14c. To bite off more than one can chew (c. 1880) is U.S. slang, from plug tobacco.

To bite the dust "be thrown or struck down," hence "be vanquished, die, be slain, perish in battle" is from 1750, earlier bite the ground (1670s), lick the dust (late 14c.), which OED identifies as "a Hebraism," but Latin had the same image; compare Virgil's procubuit moriens et humum semel ore momordit.

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case (n.1)

early 13c., "what befalls one; state of affairs," from Old French cas "an event, happening, situation, quarrel, trial," from Latin casus "a chance, occasion, opportunity; accident, mishap," literally "a falling," from cas-, past-participle stem of cadere "to fall, sink, settle down, decline, perish" (used widely: of the setting of heavenly bodies, the fall of Troy, suicides), from PIE root *kad- "to fall."

The notion is of "that which falls" as "that which happens" (compare befall). From its general nature, the word has taken on widespread extended and transferred meanings. Meaning "instance, example" is from c. 1300. Meaning "actual state of affairs" is from c. 1400. In law, "an instance of litigation" (late 14c.); in medicine, "an instance of a disease" (late 14c.).

The grammatical sense, "one of the forms which make up the inflections of a noun" (late 14c.) also was in Latin, translating Greek ptōsis "declension," literally "a falling." "A noun in the nominative singular ..., or a verb in the present indicative ...,

is conceived as standing straight. Then it falls, or is bent, or

declines into various positions" [Gilbert Murray, "Greek Studies"]

U.S. slang meaning "person" (especially one peculiar or remarkable in any way) is from 1848. Meaning "incident or series of events requiring police investigation" is from 1838. In case "in the event" is recorded from mid-14c. Case-history is from 1879, originally medical; case-study "study of a particular case" is from 1879, originally legal; case-law "law as settled by previous court cases" is from 1861.

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