Definition of mouse noun from the Oxford Advanced American Dictionary

      

    mouse

     noun
    noun
    NAmE//maʊs//
     
    (pl. mice
    NAmE//maɪs//
     
    )
     
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  1. 1a small animal that is covered in fur and has a long thin tail. Mice live in fields, in people's houses, or where food is stored a house mouse The storerooms were overrun with rats and mice. She crept upstairs,quiet as a mouse. (figurative) He was a weak little mouse of a man. see also dormouse, field mouse
  2. 2(mouses) (computing) a small device that is moved by hand across a surface to control the movement of the cursor on a computer screen Click the left mouse button twice to start the program. Use the mouse to drag the icon to a new position.
  3. Idioms
    play (a game of) cat and mouse with somebody,play a cat-and-mouse game with somebody
     
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    to play a cruel game with someone in your power by changing your behavior very often, so that they become nervous and do not know what to expect He thought the police were playing some elaborate game of cat and mouse and waiting to trap him.
See the Oxford Advanced Learner's Dictionary entry: mouse