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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.
applause (n.): early 15c., from Latin applausus, past participle of applaudere "approve by clapping hands" (see applaud).
acclaimer: "A person who acclaims or praises; an applauder", Early 19th cent. From acclaim + -er. Compare earlier acclamator.
acclamator: "A person who acclaims or joins in acclamation; an acclaimer, an applauder", Late 17th cent.; earliest use found in John Evelyn (1620–1706), diarist and writer. From post-classical Latin acclāmātor person who proclaims from classical Latin acclāmāt-, past participial stem of acclāmāre + -or.