what is slip
slip verb (DO QUICKLY) C2 [ I or T, usually + adv/prep ] to go somewhere or put something somewhere quickly, often so that you are not noticed: Just slip out of the room while nobody's looking. She slipped between the cool cotton sheets and was soon asleep. He slipped a piece of paper into my hand with his address on it. [ + two objects ] If you slip the waiter some money/slip some money to the waiter he'll give you the best table.