pull a muscle
US /pʊl ə ˈmʌsl/
UK /pʊl ə ˈmʌsl/

1.
to injure a muscle by stretching it too much
:
•
I think I pulled a muscle in my back while lifting that heavy box.
•
Always warm up properly before exercising to avoid pulling a muscle.
to injure a muscle by stretching it too much