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applaud [applaud 词源字典]: applaud: [15] English probably acquired this word directly from Latin applaudere, which meant literally ‘clap at’. It was a compound formed from the prefix ad- ‘to’ and the verb plaudere ‘clap’, source also of plaudit [17] and of explode, whose original sense seems to have been ‘drive from the stage by clapping’ (or, presumably, by any other signals of disapproval favoured by Roman audiences).
=> explode, plaudit[applaud etymology, applaud origin, 英语词源]
applaud (v.): late 15c. (implied in applauding), "to express agreement or approval; to praise," from Latin applaudere "to clap the hands in approbation, to approve by clapping hands; to strike upon, beat," from ad "to" (see ad-) + plaudere "to clap" (see plaudit). Sense of "express approval of" is from 1590s; that of "to clap the hands" is from 1590s. Figurative sense arrived in English before literal. Related: Applauded; applauding.
plaudit (n.): 1620s, short for plaudite "an actor's request for applause" (1560s), from Latin plaudite! "applaud!" second person plural imperative of plaudere "to clap, strike, beat; applaud, approve," of unknown origin (also in applaud, explode). This was the customary appeal for applause that Roman actors made at the end of a play. In English, the -e went silent then was dropped.
plaudits: "Praise", Early 17th century: plaudit shortened from Latin plaudite 'applaud!' (said by Roman actors at the end of a play), imperative plural of plaudere.