/ bɒŋ; NAmE bɑːŋ/ noun
1.
the sound made by a large bell :
the bongs of Big Ben
2.
a long pipe for smoking cannabis and other drugs, which passes the smoke through a container of water
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WORD ORIGIN
sense 1 1920s (originally US): imitative. sense 2 1970s: from Thai baung , literally cylindrical wooden tube.