mazel tov UK /ˈmaz(ə)l ˌtɒf/US /ˈmɑz(ə)lˌtɔf/ exclamation2 •Used to express congratulations or good wishes, especially at weddings. •(humorous) Said after a glass has been accidentally broken, in reference to the tradition of breaking a glass as part of a Jewish wedding, after which "mazel tov" is sometimes said.