'quickly-widened' originates from Modern English, specifically the combination of the adverb 'quickly' and the past participle 'widened', used together as a compound adjective.

'quickly-widened' was formed in Modern English by compounding two established words; there is no single older lexical ancestor for the compound itself—it arises from standard adverb + past-participle compounding common in descriptive English.

Initially it simply described an event as 'quickly' + 'widened'; the compound's meaning has remained literal, denoting that something 'became wider quickly'.