mouse

any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails

a swollen bruise caused by a blow to the eye

person who is quiet or timid

a hand operated electronic device that controls the coordinates of a cursor on your computer screen as you move it around on a pad; on the bottom of the device is a ball that rolls on the surface of the pad

a mouse takes much more room than a trackball

to go stealthily or furtively

..stead of sneaking around spying on the neighbor's house