Baby beds with high sides, or informal term for homes/apartments.
From Old English cribb meaning 'manger' or 'stall', related to German Krippe. The meaning evolved from animal feeding troughs to baby beds in the 15th century, then to slang for 'home' in 20th century African American Vernacular English.
The evolution from manger to baby bed reflects the historical reality that cribs were originally simple wooden boxes used for both feeding animals and housing infants. The slang use meaning 'home' creates a poetic full circle - from shelter for animals, to shelter for babies, to shelter for adults.
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