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Phrase(s): slow on the draw
1. Lit. slow in drawing a gun. (Cowboy and gangster talk.) • Bill got shot because he’s so slow on the draw. • The gunslinger said, "I have to be fast. If I’m slow on the draw, I’m dead." 2. and slow on the uptake Fig. slow to figure something out; slow-thinking. • Sally didn’t get the joke because she’s sort of slow on the draw. • Bill—who’s slow on the uptake—didn’t get the joke until it was explained to him.
McGrawhill's American Idioms And Phrasal Verbs