二十一天不出壳，坏蛋二十一天不出殼，壞蛋二十一天不出殼，壞蛋

not hatching after twenty-one days: a bad egg

Saying俗语俗語

Two-part saying歇后语歇後語 · Widely known

Meaning: An insult for a rotten person. Harsh, abusive. Like 'a bad egg'.
Wordplay: 坏蛋 (huàidàn) is literally a spoiled egg and also a scoundrel.

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Simplified: 二十一天不出壳，坏蛋
Traditional (Taiwan): 二十一天不出殼，壞蛋
Pinyin: èrshí yī tiān bù chū ké, huàidàn
Bopomofo: ㄦˋ ㄕˊ ㄧㄊㄧㄢㄅㄨˋ ㄔㄨㄎㄜˊ，ㄏㄨㄞˋ ㄉㄢˋ

Written with HSK 7-9 vocabulary, at CEFR level C1.

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