'calmly-gathered' originates from the combination of 'calmly' and 'gathered', where 'calmly' is derived from the word 'calm', meaning 'peaceful', and 'gathered' is the past participle of 'gather', meaning 'to bring together'.

'calmly' changed from the Old English word 'calm', and 'gathered' from the Old English 'gadrian', eventually forming the modern English phrase 'calmly-gathered'.

Initially, 'calmly' meant 'in a peaceful manner', and 'gathered' meant 'brought together', which has largely remained the same in modern usage.