Meaning of the word "the gray mare is the better horse" in English

What does "the gray mare is the better horse" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the gray mare is the better horse

US /ðə ɡreɪ mer ɪz ðə ˈbetər hɔːrs/
UK /ðə ɡreɪ meər ɪz ðə ˈbetə hɔːs/
"the gray mare is the better horse" picture

Idiom

a proverb used to suggest that the wife rules the household or is more capable than the husband

Example:
In their house, it's clear that the gray mare is the better horse.
He may be the boss at work, but at home, the gray mare is the better horse.