'expertly-applied' originates from the combination of 'expertly' and 'applied', where 'expertly' is derived from 'expert', meaning 'a person with a high level of knowledge or skill', and 'applied' is the past participle of 'apply', meaning 'to put to use'.

'expertly' evolved from the Old French word 'expert', and 'applied' comes from the Latin 'applicare', meaning 'to attach or join'.

Initially, 'expertly' meant 'in a manner of an expert', and 'applied' meant 'put to use'. Together, they convey the idea of something being used with skill.