odd man

Etymology
From +, probably after a Scandinavian source. Compare 🇨🇬.

Noun

 * 1) In a group having an odd number of people, someone with the casting vote; an arbiter.
 * 2) Someone who does odd jobs.
 * 3)  A man who trains in company with a boat's crew, so that he can take the place of anybody who falls ill.
 * 1)  A man who trains in company with a boat's crew, so that he can take the place of anybody who falls ill.