Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
linesman is a noun meaning "official (in tennis, soccer, football, etc.) who assists the referee in some way (especially by watching for out of bounds or offside)". It carries 2 recorded senses.
official (in tennis, soccer, football, etc.) who assists the referee in some way (especially by watching for out of bounds or offside)
a person who installs or repairs electrical or telephone lines
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for linesman come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.