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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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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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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gaze (n.)
1540s, "thing stared at;" 1560s as "long look," from gaze (v.). Gaze-hound (1560s) was an old name for a dog that follows prey by sight, not scent.
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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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envisage (v.)
1778, "look in the face of," from French envisager "look in the face of," from en- "in" (see en- (1)) + visage "face" (see visage). Hence "to apprehend mentally, contemplate" (1837). Related: Envisaged; envisaging; envisagement.
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mirror (n.)

mid-13c., mirour, "polished surface (of metal, coated glass, etc.) used to reflect images of objects," especially the face of a person, from Old French mireoir "a reflecting glass, looking glass; observation, model, example," earlier miradoir (11c.), from mirer "look at" (oneself in a mirror), "observe, watch, contemplate," from Vulgar Latin *mirare "to look at," variant of Latin mirari "to wonder at, admire" (see miracle).

The Spanish cognate, mirador (from mirar "to look, look at, behold"), has come to mean "watch tower, gallery commanding an extensive view." Latin speculum "mirror" (or its Medieval Latin variant speglum) is the source of words for "mirror" in neighboring languages: Italian specchio, Spanish espejo, Old High German spiegal, German Spiegel, Dutch spiegel, Danish spejl, Swedish spegel. An ancient Germanic group of words for "mirror" is represented by Gothic skuggwa, Old Norse skuggsja, Old High German scucar, which are related to Old English scua "shade, shadow."

Words for 'mirror' are mostly from verbs for 'look', with a few words for 'shadow' or other sources. The common use of the word for the material 'glass' in the sense of 'mirror' seems to be peculiar to English. [Carl Darling Buck, "A Dictionary of Selected Synonyms in the Principal Indo-European Languages," 1949]

Figurative use, "that in or by which anything is shown or exemplified," hence "a model (of good or virtuous conduct)" is attested from c. 1300. Mirrors have been used in divination since classical and biblical times, and according to folklorists, in modern England they are the subject of at least 14 known superstitions. Belief that breaking one brings bad luck is attested from 1777. Mirror image "something identical to another but having right and left reversed" is by 1864. Mirror ball attested from 1968. To look in (the) mirror in the figurative sense of "examine oneself" is by early 15c.

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