From Longman Dictionary of Contemporary Englishmousemouse1 /maʊs/ ●●● S2 W3 noun [countable] 1 
(plural mice /maɪs/)HBA a small furry animal with a pointed nose and a long tail that lives in people’s houses or in fields The cat laid a dead mouse at my feet. a field mouse2 (plural mouses)TD a small object that you move with your hand to give instructions to a computer Select the printer icon and then click the left mouse button.3 (plural mice) informalNERVOUS a quiet nervous person → play cat and mouse at cat(4), → quiet as a mouse at quiet1(1)
(plural mice /maɪs/)HBA a small furry animal with a pointed nose and a long tail that lives in people’s houses or in fields The cat laid a dead mouse at my feet. a field mouse2 (plural mouses)TD a small object that you move with your hand to give instructions to a computer Select the printer icon and then click the left mouse button.3 (plural mice) informalNERVOUS a quiet nervous person → play cat and mouse at cat(4), → quiet as a mouse at quiet1(1)Examples from the Corpus
mouse• A mouse click on a menu item would do it.• a field mouse• Bill Atkinson quickly hacked a driver program that allowed the mouse to move a cursor on the computer screen.• It was the mouse that roared, even if the mouse happens to weigh 286 pounds.• The mouse controls a fly swatter.• Heatley stayed until 3.30 a.m., when all of the untreated mice had died.mousemouse2 verb → mouse over somethingFrom Longman Business Dictionarymousemouse /maʊs/ noun (plural mouses or mice /maɪs/) [countable]COMPUTING a small object connected to a computer by a wire, which you move around on a flat surface using your hand. You press the buttons to make the computer do certain tasksYou click on the icons with the mouse to go from one program to another.Origin mouse Old English mus 