'accidentally-checked' originates from the combination of 'accidentally' and 'checked', where 'accidentally' means 'by chance or without intention' and 'checked' means 'verified or marked'.

'accidentally' comes from the Latin word 'accidentalis', and 'checked' comes from the Old French word 'eschequier', which evolved into the modern English word 'check'.

Initially, 'accidentally' meant 'by chance', and 'checked' meant 'to verify'. Together, they imply an unintended verification.