stun Look up stun at Dictionary.com
c.1300, "to daze or render unconscious" (from a blow, powerful emotion, etc.), probably aphetic of O.Fr. estoner "to stun" (see astonish). Stunning popularized for "splendid, excellent" c.1849.
astound Look up astound at Dictionary.com
c.1600, from M.E. astouned, astoned (c.1300), pp. of astonien "to stun" (see astonish), with more of the original sense of V.L. *extonare.
astonish Look up astonish at Dictionary.com
mid-14c., astonien, from O.Fr. estoner "to stun, daze, deafen, astound," from V.L. *extonare, from L. ex- "out" + tonare "to thunder" (see thunder); so, lit. "to leave someone thunderstruck." The modern form (influenced by English verbs in -ish, e.g. distinguish, diminish) is attested from c.1530. Related: Astonishment.
"No wonder is thogh that she were astoned" [Chaucer, "Clerk's Tale"]
dwell Look up dwell at Dictionary.com
O.E. dwellan "to mislead, deceive," originally "to make a fool of, lead astray," from P.Gmc. *dwaljanan (cf. O.N. dvöl "delay," dvali "sleep;" M.Du. dwellen "to stun, make giddy, perplex;" Dan. dvale "trance, stupor," dvaelbćr "narcotic berry," source of M.E. dwale "nightshade"), from PIE *dhwel-. Related to O.E. gedweola "error, heresy, madness." Sense shifted in M.E. through "hinder, delay," to "linger" (c.1200, as still in phrase to dwell upon), to "make a home" (mid-13c.). Related: Dwelled; dweller; dwells.
knock (v.) Look up knock at Dictionary.com
O.E. cnocian (W.Saxon cnucian), likely of imitative origin. Meaning "deprecate, put down" is from 1892. Knockoff "cheap imitation" is from 1966. Knock out "to stun by a blow for a 10-count" in boxing is short for to knock out of time; slang knockout "attractive person" is from 1892. To knock oneself out "make a great effort" is from 1936. Knock-kneed first attested 1774. Command knock it off "stop it" is first recorded 1902. Knocker "door banger" is from 1598; knockers "a woman's breasts" is from 1941. Knock up is 1663 in sense of "arouse by knocking at the door;" however it is little used in this sense in Amer.Eng., where the phrase means "get a woman pregnant" (1813), possibly ult. from knock "to copulate with" (1598; cf. slang knocking-shop "brothel," 1860).
"Knocked up in the United States, amongst females, the phrase is equivalent to being enciente, so that Englishmen often unconsciously commit themselves when amongst our Yankee cousins." [John Camden Hotten, "The Slang Dictionary," London, 1860]