'overspent' originates from English, specifically the prefix 'over-' meaning 'excessively' and the verb 'spend' meaning 'to use money'.

'overspend' formed in Middle English by combining 'over-' and 'spend', and its past tense and past participle 'overspent' followed regular English verb formation.

Initially, it meant 'to spend more than is allowed or available', and this meaning has remained the same in modern usage.