linesman

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun official (in tennis, soccer, football, etc.) who assists the referee in some way (especially by watching for out of bounds or offside)
noun a person who installs or repairs electrical or telephone lines

From line + -s- + -man.

"[*] [*] Camp phrase for the French linesmen. — One of the Six Hundred: A Novel, James Grant
Linesmen can loosen and dirty insulators to cause power leakage. — Simple Sabotage Field Manual, United States. Office of Strategic Services
It had been secretly a great grief to the old gentleman that his only child did not know the difference between a linesman and an inside right, and, more, did not seem to care to know. — The Man Upstairs and Other Stories, P. G. (Pelham Grenville) Wodehouse

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