to make a sudden, small movement because of pain or fear
to flinch
to bend your knees and lower yourself so that you are close to the ground and leaning forward slightly
to crouch down
to cause food, drink, pills, etc. to move from your mouth into your stomach by using the muscles of your throat
to swallow
to make an expression of pain, strong dislike, etc. in which the face twists in an ugly way
to grimace
to hold very tightly
grip
to produce a deep, long sound showing great pain or unhappiness
to let out a groan
to raise your hand and move it from side to side as a way of greeting someone, telling someone to do something, or adding emphasis to an expression
to give a wave