'uncloud' originates from the prefix 'un-' meaning 'not' or 'reverse' and the word 'cloud', where 'cloud' meant 'to cover with clouds or make unclear'.

'uncloud' changed from the Old English word 'clud' meaning 'mass of rock' and eventually became the modern English word 'cloud', which then combined with 'un-' to form 'uncloud'.

Initially, 'cloud' meant 'mass of rock', but over time it evolved to mean 'to cover with clouds', and 'uncloud' now means 'to clear or make free from clouds'.