odd man out

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odd man out

an unusual or atypical person or thing. I'm odd man out because I'm not wearing a tie. You had better learn to use the new system software unless you want to be odd man out.
See also: man, odd, out

odd man out

1. A person who is left out of a group for some reason, as in The invitation was for couples only, so Jane was odd man out. [Mid-1800s]
2. Something or someone who differs markedly from the others in a group, as in Among all those ranch-style houses, their Victorian was odd man out. [Late 1800s]
See also: man, odd, out