gangbuster
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gang·bust·er

noun \ˈgaŋ-ˌbəs-tər\

Definition of GANGBUSTER

: one engaged in the aggressive breakup of organized criminal gangs
like gangbusters
: with great or excessive force or aggressiveness <came on like gangbusters>; also : with great speed or success <was selling like gangbusters>

First Known Use of GANGBUSTER

1940

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