Literally, “to put one's flag in one's pocket”.
- IPA(key): /mɛ.tʁə sɔ̃ dʁa.po dɑ̃ sa pɔʃ/ ~ /me.tʁə sɔ̃ dʁa.po dɑ̃ sa pɔʃ/
mettre son drapeau dans sa poche
- (informal, figuratively) to conceal one's true feelings, to hide what one really thinks, not to reveal one's true convictions or allegiances