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wag [wag 词源字典]: wag: [13] Wag was derived from the Middle English descendant of Old English wagian ‘totter’, a word related to English wave of the sea. Waggle [15] was based on it. The noun wag ‘comical fellow’, first recorded in the 16th century, is generally taken to be short for waghalter, literally ‘someone who swings to and fro in a noose’, hence ‘someone destined for the gallows’.
=> waggle[wag etymology, wag origin, 英语词源]
casement (n.): type of hinged sash-window that swings open like doors, early 15c., "hollow molding," probably a shortening of Old French dialectal enchassement "window frame" (Modern French enchâssement), from en- "in," prefix forming verbs, + casse "case, frame" (see case (n.2)) + -ment. Or possibly from Anglo-Latin cassementum, from casse. The "window" sense is from 1550s in English. Old folk etymology tended to make it gazement.

The Irish surname is originally Mc Casmonde (attested from 1429), from Mac Asmundr, from Irish mac "son of" + Old Norse Asmundr "god protector."
follow-through (n.): 1896, of golf swings, from verbal phrase follow through; see follow (v.) + through (adv.). Figurative use from 1926.
mood (n.1): "emotional condition, frame of mind," Old English mod "heart, frame of mind, spirit; courage, arrogance, pride; power, violence," from Proto-Germanic *motha- (cognates: Old Saxon mod "mind, courage," Old Frisian mod "intellect, mind, intention," Old Norse moðr "wrath, anger," Middle Dutch moet, Dutch moed, Old High German muot, German Mut "courage," Gothic moþs "courage, anger"), of unknown origin.

A much more vigorous word in Anglo-Saxon than currently, and used widely in compounds (such as modcræftig "intelligent," modful "proud"). To be in the mood "willing (to do something)" is from 1580s. First record of mood swings is from 1942.
swinger (n.): 1540s, "one who or that which swings," agent noun from swing (v.). Also (now obsolete) "anything big or great" (1580s). Meaning "person who is sexually promiscuous" is from 1964. Old English swingere (n.) meant "one who strikes, scourger."
swingletree (n.): mid-15c., from swingle "that which swings" + tree (n.) in obsolete Middle English sense "pole."