四世同堂 sìshìtóngtáng four generations under one roof Origin Definitions Defs Strokes Stroke Words Sentences Sents 四 sì numeral four the number four; complex form used for financial purposes is 肆 sì世 shì nounnumeral generation (bound form) a generation; a period of thirty years同堂 tóngtáng to live under the same roof To live in the same house or share a household, usually used of different generations of a family.