'suddenly-built' originates from the combination of 'suddenly' and 'built', where 'suddenly' comes from Middle English 'sodein', meaning 'unexpected', and 'built' is the past participle of 'build', from Old English 'byldan'.

'suddenly' changed from the Middle English word 'sodeinly' and 'built' from the Old English 'byldan', eventually forming the modern English term 'suddenly-built'.

Initially, 'suddenly' meant 'unexpectedly', and 'built' meant 'constructed'. Together, they convey the idea of something being constructed unexpectedly or quickly.