the.com/serviceman

means A man employed to repair, maintain, or install equipment, or one serving in the armed forces.

from A straightforward compound from 'service' (Latin 'servitium,' the condition of a servant, from 'servus,' slave) plus 'man.' The repair-trade sense grew in the 20th century as household machines—washers, furnaces, radios—multiplied and needed someone to keep them running; the military sense runs alongside it, 'service' meaning duty to one's country rather than to a washing machine.