A murder or killing, especially one done as a favor or by a hired assassin.
American slang from early-to-mid 20th century, combining bump (to kill) with off (to finish). The term emerged from gangster and underworld vocabulary in the 1920s-1930s.
Criminals invented slang to avoid being caught discussing crimes directly—'bumpoff' is dark rhyming slang hiding a serious crime in casual language, just like 'hit' or 'whack'.
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