move a muscle
Bestir oneself even slightly. This idiom is usually put negatively, either with implied criticism, as in She won't move a muscle to help get dinner, or not, as in When I saw the deer, I stayed quite still, not daring to move a muscle. It was first recorded in 1889.
Words nearby move a muscle
movable joint,
movable testis,
movable type,
movable-do system,
move,
move a muscle,
move heaven and earth,
move in,
move on,
move out,
move up