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Phrase(s): quick on the trigger [and] quick on the draw
1. Lit. quick to draw a gun and shoot. • Some of the old cowboys were known to be quick on the trigger. • Wyatt Earp was particularly quick on the draw. 2. Fig. quick to respond to anything. • John gets the right answer before anyone else. He’s really quick on the trigger. • Sally will probably win the quiz game. She’s really quick on the draw.
McGrawhill's American Idioms And Phrasal Verbs