I now pronounce you man and wife.

At a wedding ceremony, the minister or wedding officiant says this to officially announce that the couple is married.

This phrase is very formal-sounding.

"I now pronounce you..." means "I officially say that you are..." This expression is not often used outside of wedding ceremonies. If someone does say "I now pronounce you..." in another situation, it's probably a joke.

This phrase appears in these lessons: