The term 'USES A MICROWAVE' can be broken down into two crossword solutions: 'NUKES' and 'HEATS'. NUKES is a slang term for using a microwave to heat up food quickly. It is derived from the sound that microwaves make when they are in use. HEATS is another way of saying that someone is using a microwave to heat up food. Microwaves are a common kitchen appliance that use electromagnetic radiation to heat food quickly and efficiently.