'accidentally-placed' originates from the combination of 'accidentally' and 'placed', where 'accidentally' comes from Latin 'accidentalis', meaning 'happening by chance', and 'placed' from Old French 'placer', meaning 'to put or set'.

'accidentally' evolved from the Latin 'accidentalis' through Old French, while 'placed' came from Old French 'placer', eventually forming the modern English term 'accidentally-placed'.

Initially, 'accidentally' meant 'happening by chance', and 'placed' meant 'to put or set', which together convey the current meaning of 'positioned by chance'.