Past tense of crib; confined in a small space, or copied/plagiarized from another source.
From 'crib' (Old English 'cribbe' from Germanic roots). Originally meant to put in a crib (a small bed), then expanded to mean confine, and later came to mean copy or plagiarize.
The slang use of 'cribbed' for plagiarized probably comes from the cramped, enclosed feeling of copying someone else's confined ideas rather than having space for original thought.
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