公婆

husband's parents / parents-in-law

public / collectively owned / common / international (e.g. high seas, metric system, calendar) / make public / fair / just / Duke, highest of five orders of nobility 五等爵位[wu3 deng3 jue2 wei4] / honorable (gentlemen) / father-in-law / male (animal)

grandmother / matron / mother-in-law / (slang) femme (in a lesbian relationship)

lit. the ugly daughter-in-law must sooner or later meet her parents-in-law (idiom) / fig. it's not something you can avoid forever