“Racking one's brains” in Japanese
Short answer
Racking one's brains in Japanese is “苦慮” (kuryo). Full meaning: racking one's brains, worrying oneself, being anxious.
Other ways to say “Racking one's brains” in Japanese
腐心
fushin taking great pains (to do), making every effort, having a lot of trouble (doing), racking one's brains
頭が痛い
atamagaitai having a headache; racking one's brains, troubling over something
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