ruby wedding
noun🔊/ˌruːbi ˈwedɪŋ/
🔊/ˌruːbi ˈwedɪŋ/
(British English) (US English ruby anniversary)
(also ruby wedding anniversary US English, British English)
the 40th anniversary of a wedding 红宝石婚（结婚 40 周年纪念）