Past tense of 'common': to share something with others; to hold land or property in common; to graze animals on common land.
From common as a verb, derived from Latin communis. Medieval English developed 'common' as a verb meaning to use commonly or share.
When villagers 'commoned' their sheep on shared pasture, they were literally acting out democracy—every person had equal rights to the same resource. It's the verb form of freedom!
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