Expression: Fais gaffe !
Pronunciation: [feh gahf]
Meaning: Be careful! Watch out!
Literal translation: Make mistake!
Notes: The French expression fais gaffe is interesting because it means just the opposite of its literal translation. Faire une gaffe means "to make a mistake, to blunder," so you would think that "be careful!" would be something more like ne fais pas de gaffe ! Apparently leaving out une is enough to turn the meaning around. You can also say Fais gaffe à toi to mean "Watch yourself."
Ça peut être dangereux - fais gaffe !
That can be dangerous - be careful!
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More: Expressions with faire | Most common French phrases