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In page Polygyny:

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The original wife (or legal wife) was referred to as the zhèngshì (Chinese: 正室; Korean: 정실, jeongsil; lit.'main room') in China, Japan and Korea, with dàpó (Chinese: 大婆; 'big woman, big wife') as the slang term. The official wife was called 'big mother' (simplified Chinese: 大妈; traditional Chinese: 大媽; pinyin: dàmā), mother, or aunt. The child of the concubine addressed the big mother as "aunt".[citation needed]