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prank (n.)

"a ludicrous trick" [Johnson], played sometimes in malice but more often in sport, 1520s, a word of uncertain origin, perhaps related to the obsolete verb prank "act ostentatiously, show off" (mid-15c.), also "to decorate, adorn in a showy manner" (1540s), which is related to Middle Low German prank "display" (compare also Dutch pronken, German prunken "to make a show, to strut"). The verb in the "play a trick on" sense also is from 1520s. Related: Pranked; pranking.

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Definitions of prank from WordNet
1
prank (v.)
dress or decorate showily or gaudily;
Roses were pranking the lawn
prank (v.)
dress up showily;
He pranked himself out in his best clothes
2
prank (n.)
acting like a clown or buffoon;
Synonyms: buffoonery / clowning / japery / frivolity / harlequinade
prank (n.)
a ludicrous or grotesque act done for fun and amusement;
Synonyms: antic / joke / trick / caper / put-on
From wordnet.princeton.edu