Etymology
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revise (v.)

1560s, "to look at again" (a sense now obsolete), from French reviser (13c.), from Latin revisere "look at again, visit again, look back on," frequentative of revidere (past participle revisus) "see again, go to see again," from re- "again" (here probably denoting "repetition of an action;" see re-) + videre "to see" (from PIE root *weid- "to see"). Meaning "to look over again with intent to improve or amend" is recorded from 1590s. Related: Revised; revising.

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introspection (n.)
1670s, "action of closely inspecting or examining," noun of action from past participle stem of Latin introspicere "to look into, look at, examine, observe attentively," from intro- "inward" (see intro-) + specere "to look at" (from PIE root *spek- "to observe"). Meaning "action of searching one's feelings or thoughts" is from 1807.
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despise (v.)

"look down upon, scorn, disdain, treat with contempt," c. 1300, despisen, from Old French despis-, present-participle stem of despire "to despise," from Latin despicere "look down on, scorn," from de- "down" (see de-) + spicere/specere "to look at" (from PIE root *spek- "to observe"). Related: Despised; despising.

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introspective (adj.)
"having the quality of looking within," 1820 (Southey), from Latin introspect-, past participle stem of introspicere "look into, look at" (see introspection) + -ive. Related: Introspectively; introspectiveness.
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stink eye (n.)
"dirty look," by 1972, perhaps from Hawaiian slang.
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regard (v.)

mid-14c., regarden, "consider" (that something is so or a certain way), from Old French regarder "to look at, take notice of," from re-, here perhaps an intensive prefix, + garder "look, heed," from a Germanic language (see guard (n.)).

Sense of "consider of importance or interest" is from 1510s. Meaning "look upon, observe" is from 1520s, as is that of "observe a certain respect toward." From 1610s as "look upon" (with a certain feeling), "have or show a certain feeling for." Related: Regarded; regarding.

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perspicacious (adj.)

"sharp-sighted," also "of acute mental discernment," 1630s, formed as an adjective to perspicacity, from Latin perspicax "sharp-sighted, having the power of seeing through; acute," from perspicere "look through, look closely at," from per "through" (from PIE root *per- (1) "forward," hence "through") + specere "look at" (from PIE root *spek- "to observe"). Related: Perspicaciously; perspicaciousness.

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retrospect (n.)

c. 1600, "a regard or reference" (to something), from Latin retrospectum, past participle of retrospicere "look back," from retro "back" (see retro-) + specere "look at" (from PIE root *spek- "to observe"). Meaning "survey of past events" is from 1660s.

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squiz (v.)
"to look at," 1916, Australian, perhaps a blend of squint and quiz.
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Perspex 
1935, trade name in Britain for what in the U.S. is called Plexiglas or Lucite, irregularly formed from Latin perspect-, past participle stem of perspicere "look through, look closely at" (see perspective).
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