Taivo A Taiwan Mandarin dictionary

挖空心思

wākōngxīnsi

ㄨㄚ ㄎㄨㄥ ㄒㄧㄣ ˙ㄙ

  1. 1to dig for thoughts (idiom); to search everything for an answer
  2. 2to rack one's brains

Keep 挖空心思 and it comes back until you know it.

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