'perpetually-watched' originates from the combination of 'perpetual' and 'watch,' where 'perpetual' meant 'never-ending' and 'watch' meant 'to observe.'

'perpetual' changed from the Latin word 'perpetualis' and 'watch' from the Old English word 'wæccan,' eventually forming the modern English term 'perpetually-watched.'

Initially, 'perpetual' meant 'everlasting,' and 'watch' meant 'to keep vigil,' evolving into the current meaning of 'constantly under observation.'