'unfence' originates from the prefix 'un-' meaning 'not' or 'reverse' and the word 'fence' from Middle English 'fens', derived from Old French 'defens', meaning 'defense'.

'fens' transformed into the modern English word 'fence', and with the addition of the prefix 'un-', it became 'unfence'.

Initially, 'fence' meant 'defense or protection', and 'unfence' evolved to mean 'remove the defense or barrier'.