プログレッシブ和英中辞典(第4版)の解説
しあん【思案】
〔考え〕thought；〔熟考〕consideration；〔沈思〕reflection
思案する think ((about))；consider; reflect ((on))
机に向かって思案に暮れた
I sat at my desk, lost [buried] in thought.
どうして急場をしのごうかと思案を巡らせた
「I pondered [I thought hard, hunting for] a way to get through the crisis.
これより他に思案のしようがない
I can think of no other [better] plan than this.
ここが思案のしどころだ
This calls for careful consideration.／We've got to think this over carefully.
思案に余る
思案に余って叔父に真相を打ち明けた
He told his uncle what had (really) happened because he was 「quite at a loss what to do [at his wit's end].
思案顔
彼女は思案顔で入って来た
She had a troubled look on her face as she came in.
思案投げ首
思案投げ首である
be at a loss what to do／be at one's wit's end