1.
wife (informal)
An informal, familiar term for one's wife or someone else's wife. Primarily used by men in casual conversation.
Usage
Used mainly by middle-aged and older men to refer to their own wife in casual settings. It has a down-to-earth, familiar tone. Not appropriate in formal situations, where 妻 or 家内 would be used instead.
The word comes from 上さん, originally a respectful term for a woman of higher status or the lady of the house.
Register
Informal and spoken. Common among working-class and older male speakers. Younger men tend to prefer 奥さん (for others' wives) or 妻 (for their own).