weapon - definition and synonyms

noun [countable] 

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  1. 1
    an object that can be used to hurt people or damage property, for example a gun, knife, or bomb

    The murder weapon still hasn’t been found.

    carry a weapon:

    The officers all carried automatic weapons.

  2. 2
    something that helps you to achieve something difficult or to get rid of something bad

    Group pressure is the most powerful weapon we have.

    weapon against:

    an effective weapon against stress