mettre sa main au feu

Literally, “to put one's hand in fire”. Compare German für etwas die Hand ins Feuer legen.

• IPA^(key): /mɛ.tʁə sa mɛ̃ o fø/

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mettre sa main au feu

1. to bet one's boots that, to bet one's bottom dollar that

   Synonyms: donner sa main à couper, mettre sa main à couper, mettre sa tête à couper

   Je mettrais ma main au feu qu’ils ont baisé. ― I would put my hand in the fire that they fucked; I would bet my bottom dollar that they fucked.