Allowed to continue without being stopped, controlled, or examined for problems.
From 'check' (to stop or verify) with the prefix 'un-' meaning not. 'Check' itself comes from Persian 'shah' through French, originally meaning to stop the king's advance in chess.
The word 'check' traveled from Persian chess terminology through French into English meaning 'stop,' then 'verify'—it's a perfect example of how games reshape language worldwide.
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