Dòngwùyuán lǐ de mǔlǎohǔ zhèngzài zhàogù tā de yòuzǎi.
The tigress at the zoo is caring for her cubs.
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usage
母老虎 literally means 'female tiger' (母 = female, 老虎 = tiger). Figuratively it describes a fierce, domineering woman, especially a wife or mother-in-law. The tone is usually humorous or exasperated rather than deeply insulting.