the.com/weed whacker

means A handheld gardening tool with a spinning nylon line that trims grass and weeds in spots a mower can't reach, like edges, fences, and poles.

from An American compound from the 1970s, straightforwardly built from 'weed' (the unwanted plants) and 'whack' (to strike repeatedly) plus the agent suffix '-er.' It emerged alongside the string trimmer's invention, when the device needed a name that sounded as blunt and effective as the tool itself — no Latin roots required, just plain description of what it does to your lawn's overgrowth.