Etymology
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Words related to hack

hacker (n.)
early 13c. (as a surname), "a chopper, cutter," perhaps also "one who makes hacking tools," agent noun from hack (v.1).

Meaning "one who gains unauthorized access to computer records" is attested by 1975, and this sense seems to suggest hack (v.1), but the computer use is said to be from slightly earlier tech slang sense of "one who works like a hack at writing and experimenting with software, one who enjoys computer programming for its own sake," reputedly a usage that evolved at Massachusetts Institute of Technology (however an MIT student from the late 1960s recalls hack (n.) being used then and there in the general sense of "creative prank." This suggests rather a connection with hack (n.2) via the notion of "plodding, routine work." There may be a convergence of both words here.
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*keg- 
Proto-Indo-European root meaning "hook, tooth."

It forms all or part of: hacek; hack (v.1) "to cut roughly, cut with chopping blows;" hake; Hakenkreuz; heckle; hook; hooker.

It is the hypothetical source of/evidence for its existence is provided by: Russian kogot "claw;" Old English hoc "hook, angle."
hew (v.)

Old English heawan "to chop, hack, gash, strike with a cutting weapon or tool" (class VII strong verb; past tense heow, past participle heawen), earlier geheawan, from Proto-Germanic *hawwanan (source also of Old Norse hoggva, Old Frisian hawa, Old Saxon hauwan, Middle Dutch hauwen, Dutch houwen, Old High German houwan, German hauen "to cut, strike, hew"), from PIE *kau- "to hew, strike," a root more widely developed in Slavic (source also of Old Church Slavonic kovo, Lithuanian kauti "to strike, beat, fight;" Polish kuć "to forge," Russian kovat' "to strike, hammer, forge;" Latin cudere "to strike, beat;" Middle Irish cuad "beat, fight").

Weak past participle hewede appeared 14c., but hasn't yet entirely displaced hewn. Seemingly contradictory sense of "hold fast, stick to" (in phrase hew to), 1891, developed from earlier figurative phrase hew to the line "stick to a course," literally "cut evenly with an axe or saw." Related: Hewed; hewing.

hackney (n.)
"small saddle horse let out for hire," c. 1300, from place name Hackney (late 12c.), Old English Hacan ieg "Haca's Isle" (or possibly "Hook Island"), the "isle" element here meaning dry land in a marsh. Now well within London, it once was pastoral and horses apparently were kept there. Hence the use for riding horses, with subsequent deterioration of sense (see hack (n.2)). Old French haquenée "ambling nag" is an English loan-word.
hacksaw (n.)
1867, from hack (v.1) + saw (n.1) "toothed cutting tool."
haggis (n.)

dish of chopped entrails, c. 1400, now chiefly Scottish, but it was common throughout England to c. 1700, of uncertain origin. Perhaps from Old French hacheiz "minced meat," from agace "magpie," on analogy of the odds and ends the bird collects. The other theory [Klein, Watkins, The Middle English Compendium] traces it to Old English haggen "to chop," or directly from Old Norse höggva "to hew, cut, strike, smite" (see hack (v.1)).

haggle (v.)
1570s, "to cut unevenly, mangle in cutting" (implied in haggler "clumsy workman"), frequentative of haggen "to chop" (see hack (v.1)). Sense of "argue about price" first recorded c. 1600, probably from notion of chopping away. Related: Haggled; haggling.
nuthatch (n.)

type of small bird living in holes in trees, mid-14c. (early 13c. as a surname), note-hach, probably so called from its habit of breaking open and eating nuts; from nut (n.) + second element related to hack (v.) and hatchet.

hackneyed (adj.)
"trite, so overused as to have become uninteresting," 1749, figurative use of past-participle adjective from hackney (v.) "use a horse for riding" (1570s), hence "make common by indiscriminate use" (1590s), from hackney (n.), and compare hack (n.2) in its specialized sense of "one who writes anything for hire." From 1769 as "kept for hire."