'accidentally-declined' originates from the combination of 'accidentally' and 'declined', where 'accidentally' comes from Latin 'accidentalis', meaning 'happening by chance', and 'declined' from Latin 'declinare', meaning 'to bend down or turn away'.

'accidentally' evolved from the Latin 'accidentalis', and 'declined' from the Latin 'declinare', eventually forming the modern English term 'accidentally-declined'.

Initially, 'accidentally' meant 'by chance', and 'declined' meant 'to turn away', but together they evolved to mean 'unintentionally refused'.