Makes something less tight, less strict, or less firmly held; causes something to become free or relaxed.
From Old Norse 'lauss' (loose, free), the verb 'loosen' emerged in Middle English and the '-s' marks third-person singular present tense.
Your body literally loosens muscles as you warm up because tension is the default state—evolution made us naturally tight and ready for danger, so loosening requires active effort and is why stretching feels so good.
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