plural of chien de poche

a pocket handkerchief, a pocket square / a postage stamp (a very exiguous place)

(informal) in the bag (virtually assured of success)

plural of livre de poche

a small cheap paperback book; a pocketbook

(idiomatic) to purchase without seeing the object in question; to buy on trust; to be sold a pig in a poke

(informal, figuratively, simile) to know like the back of one's hand, to know backwards, to know inside and out

(figuratively) to pay out of one's own pocket

(transitive, informal, figuratively) to get on someone's good side, to get someone to like oneself; to twist someone around one's little finger

Alternative form of mettre dans sa poche