The phrase 'suddenly-broadened' is a compound of 'suddenly' and the past participle 'broadened.' 'Broaden' originates from Old English, specifically the word 'brādian,' where 'brād' meant 'broad.'

'Broaden' changed from the Old English word 'brādian' and eventually became the modern English word 'broaden.' 'Suddenly' comes from 'sudden' + '-ly.'

Initially, 'broaden' meant 'to make broad or wider,' and 'suddenly' meant 'in an unexpected manner.' The compound now describes something that has become wider in a very short time or unexpectedly.