A tool used for sharpening, cutting, or creating edges, or a person who works with edges; in gardening, a machine for trimming grass along borders.
From Old English 'ecg' (edge) + '-er' (one who does, or a tool for doing). The '-er' suffix creates agent nouns (people who do something) or instrument nouns (tools that do something).
In lawn care, edgers are the unsung heroes of neat landscaping—that crisp border between lawn and sidewalk requires a dedicated tool, and inventing the mechanical edger changed lawn aesthetics forever.
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