Meaning

verb remove the pins from; unfasten the pins of

originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- Proto-Germanic *pinnaz Proto-West Germanic *pinn Old English pinn Middle English pinne English pin English unpin From un- + pin.

Etymology from Wiktionary, CC BY-SA 3.0