Definition of shield noun from the Oxford Advanced Learner's Dictionary

     

    shield

     noun
    noun
    BrE BrE//ʃiːld//
     
    ; NAmE NAmE//ʃiːld//
     
     
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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. 3a person or thing used to protect somebody/something, especially by forming a barrier The gunman used the hostages as a human shield. Water is not 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(North American English) a police officer’s badge
  8. Word Origin Old English scild (noun), scildan (verb), of Germanic origin; related to Dutch schild and German Schild, from a base meaning ‘divide, separate’.Extra examples Look for something that can act as a shield, like a dustbin lid. She did not recognize the coat of arms on his shield. The car had acted as a shield, protecting him from the blast. The nose of the space capsule is protected by a heat shield. The ozone layer forms a shield against harmful solar rays. The prince presented the shield to the winners. The software provides a shield against hackers, worms and viruses. They used 400 hostages as human shields. a row of police officers behind their riot shields The gunman used the hostages as a human shield. Water is not an effective shield against the sun’s more harmful rays.
See the Oxford Advanced American Dictionary entry: shield