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Definition of muscle noun from the Oxford Advanced American Dictionary

      

    muscle

     noun
    noun
    NAmE//ˈmʌsl//
     
     
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  1. 1[countable, uncountable] a piece of body tissue that you contract and relax in order to move a particular part of the body; the tissue that forms the muscles of the body a calf/neck/thigh muscle to pull/tear/strain a muscle This exercise will work the muscles of the lower back. She tried to relax her tense muscles. He felt every muscle in his body tighten. He didn't move a muscle (= stood completely still). Topic CollocationsInjuriesbeing injured
    • have a fall/an injury
    • receive/suffer/sustain a serious injury/a hairline fracture/a gunshot wound/a concussion/whiplash injuries
    • hurt/injure your ankle/back/leg
    • damage the brain/an ankle ligament/your liver/the optic nerve/the skin
    • pull/strain/tear a hamstring/ligament/muscle/tendon
    • sprain/twist your ankle/wrist
    • break a bone/your collarbone/your leg/three ribs
    • fracture/crack your skull
    • break/chip/knock out/lose a tooth
    • burst/perforate your eardrum
    • dislocate your finger/hip/jaw/shoulder/elbow
    • bruise/cut/graze your arm/knee/shoulder
    • burn/scald yourself/your tongue
    • bang/bump/hit your elbow/head/knee (on/against something)
    treating injuries
    • treat somebody for burns/a head injury/a stab wound
    • examine/clean/dress/bandage/treat a bullet wound
    • repair a damaged/torn ligament/tendon/cartilage
    • amputate/cut off an arm/a finger/a foot/a leg/a limb
    • put on (formal) apply/take off a Band-Aid™/a sterile dressing/a bandage
    • need/require/put in/get/take out stitches
    • put on/rub on (formal) apply cream/ointment/lotion
    • have/receive/undergo physical therapy
  2. 2[uncountable] physical strength He's an intelligent player but lacks the muscle of older competitors.
  3. 3[uncountable] the power and influence to make others do what you want to exercise political/industrial/financial muscle
 
adjective heavily muscled shoulders
Idioms
flex your muscles
 
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to show someone how powerful you are, especially as a warning or threat
See muscle in the Oxford Advanced Learner's Dictionary