Strim ‧ mer /ˈstrɪməʳ/ BrE AmE British English trademark
a type of machine for cutting ↑ weed s (=unwanted garden plants) and grass in places that a LAWNMOWER cannot reach. You hold the machine in your hand and move it just above the ground, and a strong spinning plastic string cuts the grass. In the US there is a similar machine called a Weed Whacker..