Meaning

noun a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets

noun a piece of metal covered by leather with a flexible handle; used for hitting people

noun a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship

originEtymology tree Proto-Germanic *blakaz Proto-West Germanic *blak Old English blæc Middle English blak English black English jack English blackjack From black + jack.

Etymology from Wiktionary, CC BY-SA 3.0