major-muscle
nounUK /ˈmeɪ.dʒə ˈmʌs.əl/
US /ˈmeɪ.dʒɚ ˈmʌs.əl/
A major muscle is a big, strong muscle that helps you move and do hard things.
Your thigh has a major muscle that helps you run and jump.
OTHER MEANINGS
2. A muscle that is the most important one for a certain action.
The heart is a major muscle that pumps blood all day.
3. A muscle that gets used a lot when you exercise.
Doing squats works a major muscle in your legs.
4. A muscle that is easy to see and feel under the skin.
You can feel a major muscle in your arm when you make a fist.