To scrape your skin lightly against something, or for animals to eat grass from a field.
From Old English 'grasian' meaning 'to eat grass,' derived from the noun 'grass.' The meaning of scraping or touching lightly developed later as a secondary use.
Cows and sheep are 'grazers' that spend hours grazing, munching constantly—a cow can graze for up to 8 hours a day without ever moving from a small patch!
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