'untapped' originates from the prefix 'un-' meaning 'not' and the verb 'tap', which comes from Old English 'tæppian', meaning 'to draw liquid through a tap'.

'tap' changed from the Old English word 'tæppian' and eventually became the modern English word 'tap'.

Initially, 'tap' meant 'to draw liquid through a tap', but over time it evolved to include the idea of accessing or utilizing resources.