mouse
US /maʊs/
UK /maʊs/

1.
a small rodent with a pointed snout, relatively large ears and eyes, and a long, slender tail.
:
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A tiny mouse scurried across the floor.
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The cat chased the mouse.
2.
a small handheld device that is dragged across a flat surface to control the movement of a cursor on a computer screen.
:
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Click the left button on your mouse.
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My computer mouse isn't working.