Definition of shield noun from the Oxford Advanced American Dictionary

     

    shield

     noun
    noun
    NAmE//ʃild//
     
     
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  1. 1a large piece of metal or leather carried by soldiers in the past to protect the body when fighting
  2. 2= riot shield
  3. 3 a person or thing used to protect someone or something, especially by forming a barrier The gunman used the hostages as a human shield. Sunscreen may not be an effective shield against the sun's more harmful rays. She hid her true feelings behind a shield of cold indifference.
  4. 4a plate or screen that protects a machine or the person using it from damage or injury A heat shield protects the worker's hands.
  5. 5an object in the shape of a shield, given as a prize in a sports competition, etc.
  6. 6a drawing or model of a shield showing a coat of arms
  7. 7 a police officer's badge
See the Oxford Advanced Learner's Dictionary entry: shield