'expertly-supervised' originates from the combination of 'expertly' and 'supervised', where 'expertly' is derived from 'expert', meaning 'a person with a high level of knowledge or skill', and 'supervised' is the past participle of 'supervise', meaning 'to oversee'.

'expertly-supervised' combines the adverb 'expertly' with the past participle 'supervised' to form a compound adjective.

Initially, 'expertly' meant 'with expertise', and 'supervised' meant 'overseen'. Together, they convey the idea of being overseen with expertise.