What is "string trimmer"

n. A powered, hand-held garden implement that uses a rotating monofilament line to cut grass etc without damaging other objects.

A string trimmer, also called a "weed-whip", "whipper-snipper", "weed-whacker", a "weed eater" or (in the UK and Ireland) a "strimmer", is a tool which uses a flexible monofilament line instead of a blade for cutting grass and other plants near objects, or on steep or irregular terrain. It consists of a cutting head at the end of a long shaft with a handle or handles and sometimes a shoulder strap.