The wife is the key of the house.

The saying presents a wife as the person whose care, judgment, and daily work hold a household together. “Key” suggests practical control of the home as well as an indispensable role in its order and security.

It expresses a traditional view that domestic well-being depends chiefly on the wife. It can praise her importance, but it assigns household responsibility along gendered lines and should not be treated as a universal expectation.

Use when discussing a traditional household ideal or praising someone’s central role in keeping a home functioning. In present-day writing or speech, frame it carefully: its assumption that a wife bears primary domestic responsibility may sound restrictive or unwelcome.