'permanently-kept' originates from the combination of 'permanent' and 'kept', where 'permanent' comes from Latin 'permanens', meaning 'remaining to the end', and 'kept' is the past participle of 'keep', from Old English 'cēpan', meaning 'to seize, hold'.

'permanently-kept' evolved from the combination of 'permanent' and 'kept', reflecting the idea of something being held indefinitely.

Initially, it meant 'held indefinitely', and this meaning has largely remained the same in modern usage.