A friend, especially used as a friendly way to address someone; borrowed from Spanish.
From Spanish 'amigo,' derived from Latin 'amicus' meaning 'friend,' which comes from 'amare' meaning 'to love'—the idea that friends come from love is ancient.
English borrowed 'amigo' from Spanish speakers in the American Southwest and kept it even though we already had the word 'friend'—it sounds friendlier and more casual, so we use both depending on the vibe.
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