To cut grass or grain with a machine or scythe, or to knock down in a forceful way.
From Old English 'mawan' meaning to cut, related to Germanic roots and possibly Greek 'amaein' (to reap). The modern mechanical mower appeared in the 1800s.
The lawn mower is a surprisingly recent invention—before the 1830s, sheep grazed lawns at places like estates because people couldn't easily cut grass evenly. The first mechanical mower basically invented the concept of the maintained suburban lawn that now covers millions of acres.
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