What does “un coup de fouet” mean in French?

Literally, un coup de fouet is “a crack of the whip” — the sudden sting of a lash. Figuratively, it’s the everyday French idiom for a sudden burst of energy or alertness — exactly what this clip’s Koh Lanta production doctor gives contestants before a demanding trial: not a coca, but a fruit-and-sugar cocktail, un petit coup de fouet. The image is visceral: something snaps you awake, the way an actual whip-crack would.

The same idiom shows up constantly outside reality TV: « le café du matin, ça me donne un coup de fouet » (“my morning coffee gives me a boost”), or un coup de fouet moral for a jolt of motivation after bad news. It belongs to a whole family of French “coup de” idioms that turn a sudden physical blow into a sudden feeling — the same pattern behind un coup de main (a helping hand) and un coup de foudre (love at first sight, literally “a lightning strike”).