1550s, "wait, defer action," from Latin expectare/exspectare "await, look out for; desire, hope, long for, anticipate; look for with anticipation," from ex- "thoroughly" (see ex-) + spectare "to look," frequentative of specere "to look at" (from PIE root *spek- "to observe").
The figurative sense of "anticipate, look forward to" developed in Latin and is attested in English from c. 1600. Also from c. 1600 as "regard as about to happen." Meaning "count upon (to do something), trust or rely on" is from 1630s. Used since 1817 as a euphemism for "be pregnant." In the sense "suppose, reckon, suspect," it is attested from 1640s but was regarded as a New England provincialism. Related: Expected; expecting.
Old English sceawian "to look at, see, gaze, behold, observe; inspect, examine; look for, choose," from Proto-Germanic *skauwojan (source also of Old Saxon skauwon "to look at," Old Frisian skawia, Dutch schouwen, Old High German scouwon "to look at"), from Proto-Germanic root *skau- "behold, look at," from PIE *skou-, variant of root *keu- "to see, observe, perceive."
Causal meaning "let be seen; put in sight, make known" evolved c. 1200 for unknown reasons and is unique to English (German schauen still means "look at"). Spelling shew, popular 18c. and surviving into early 19c., represents obsolete pronunciation (rhymes with view). Horse racing sense is from 1903, perhaps from an earlier sense in card-playing.
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.
"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.
To despise is to look down upon with strong contempt from a superior position of some sort. To scorn is to have an extreme and passionate contempt for. To disdain is to have a high-minded abhorrence of, or a proud and haughty contempt of. [Century Dictionary]