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
The American Heritage® Idioms Dictionary
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