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Phrase(s): slow off the mark
1. Lit. slow in starting or reacting. (Compare this with quick off the mark.) • If you are always that slow off the mark you will never win the race. • Boy, you were slow off the mark there! 2. Fig. slow-witted. • The guy’s slow off the mark but very friendly. • Yes, I’m afraid Tony is a bit slow off the mark when it comes to trigonometry.
McGrawhill's American Idioms And Phrasal Verbs