Garden tool for cutting grass around the edges of a yard WordNet 3.0 & Open English WordNet

An edge trimmer or lawn edger is a garden tool, either manual or motorised, to form distinct boundaries between a lawn, typically consisting of a grass, or other soft botanical ground cover, and another ground surface feature such as a paved, concreted or asphalted area, or a granular material such as sand or gravel, or simply uncovered soil, for example an unbounded garden. Wikipedia

tool used to trim the edges of a lawn. Wikidata

A tool that is used to trim the edges of a lawn. Wiktionary