mousetrap /ˈmaʊsˌtɹæp/noun 5verb 2forms 3phrases 1 noun5 •A device for capturing or killing mice and other rodents. •(UK, informal) Ordinary, everyday cheese. •(Internet) A website designed to open another copy of itself when the user tries to close the webpage. •(historical) An antisubmarine rocket used mainly during World War II by the US Navy and US Coast Guard.Besides depth charges, they were armed with smaller forward firing antisubmarine rocket launchers called mousetraps. Fired in groups, these rockets detonated when they contacted a submarine. — 2003 •(New-Zealand) A slice of bread or toast topped with cheese and then grilled or microwaved. verb2 •(figurative) To trap; to trick or fool (someone) into a bad situation. •(Internet) To prevent (the user) from leaving a website by opening another copy when it is closed.The scammer is paid for each new visitor directed to his site. There is nothing wrong except that the user finds it impossible to leave the site because he is mousetrapped. — 2005 formsmousetrapped · mousetrapping · mousetraps Phrases with mousetrap build a better mousetrapTo create a new product, method, or idea that is better than an existing version of something already common or widely used.