What was your first clue?

What was your first clue?

A rhetorical question used to point out the obviousness of some conclusion. A: "I think something is wrong with the engine." B: "Oh really, what was your first clue? The smoke pouring out of it?"
See also: first, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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