sit
sit at someone's feet be someone's pupil or follower.
sit next to Nellie learn how to do a job or task by watching and copying someone experienced in it. informal
sit on the fence: seefence.
sit on your hands take no action.
2013Daily Telegraph It is … only the latest in a long line of child abuse and neglect cases, from Baby P to Daniel Pelka, in which the authorities have sat on their hands until a child died.
sit (heavy) on the stomach (of food) take a long time to be digested.
sit on someone's tail drive extremely close behind another vehicle, typically while waiting for a chance to overtake.
sit tight
1 remain firmly in your place.
2 refrain from taking action or changing your mind. informal
❶ 1984Studs TerkelThe Good War Our colonel told everyone to sit tight, don't leave the camp.
sit up (and take notice) suddenly start paying attention or have your interest aroused. informal