Odd man out noun
Everyone in the group considers Jake the odd man out.
I was always the odd man out at school.
If we divide our group into four there will be an odd man out.
Used to say someone is alone
This idiom was recorded in the mid 19th century; its earliest use was found in The Times.
people often do irrational or foolish things when they are in love.
I and my boyfriend have decided to get married in the summer. I don't think that's wise, since we won't have enough money saved by then to set up house. But then, one cannot love and be wise.