not move a muscle
idiomPart ofmuscle
not move a muscle — idiom
1. to stay completely still, without moving any part of your body
1.idiom
Definition
to stay completely still, without moving any part of your body
Example
The cat sat on the windowsill and did not move a muscle as the bird landed nearby.
Talia told the children to play hide-and-seek and not move a muscle until she counted to thirty.