同どう母ぼどうぼMeanings1nounsame motherUsed to indicate that siblings share the same mother, often in contrast with 異母 (different mother).See also: 異母彼かれらは同どう母ぼの兄きょう弟だいです。They are brothers by the same mother.同どう母ぼの姉あねが二人ふたりいます。I have two older sisters from the same mother.