string trimmer
nounUK /ˌstɹɪŋ ˈtɹɪmə/ · US /ˌstɹɪŋ ˈtɹɪmɚ/
Etymology From string + trimmer.
1
Agriculture, Business, Horticulture, Lifestyle A powered, hand-held garden implement that uses a rotating monofilament line to cut grass, etc., without damaging other objects.