1805, "to pluck a stringed instrument;" 1808 in sense of "drop down abruptly;" 1888 as "to hit, wound, shoot." Probably of independent imitative origin in each case. Related: Plunked; plunking.
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Definitions of plunk from WordNet
1
plunk (v.)
make or move along with a sound as of a horse's hooves striking the ground;
