'rarely-done' originates from the combination of 'rarely,' meaning 'not often,' and 'done,' the past participle of 'do,' meaning 'to perform or execute.'

'rarely' changed from the Old English word 'hrēor,' meaning 'seldom,' and 'done' from the Old English 'dōn,' meaning 'to perform.'

Initially, 'rarely-done' meant 'seldom performed,' and this meaning has largely remained the same in modern usage.