in his/her pocket
Il la met dans sa poche gauche.
He puts it in his left pocket.
Il plaça le mouchoir dans sa poche.
He placed the handkerchief in his pocket.
Le garçon a une pomme dans sa poche.
The boy has an apple in his pocket.
Il n'a pas sa langue dans sa poche.
He doesn't mince his words.
Il a glissé un paquet de cigarettes dans sa poche.
He slipped a pack of cigarettes into his pocket.
It was in his pocket.
We found this in his pocket.