MOVE A MUSCLE

{v. phr.} To move even a very little. - Used in negative sentences and questions and with "if". * /The deer stood without moving a muscle until the hunter was gone./ * /The girls were so startled that they did not move a muscle./ * /You're sitting right where you were when I left! Have you moved a muscle?/ * /The robber said he would shoot the bank worker if he moved a muscle./