プログレッシブ和英中辞典(第4版)の解説
さっかく【錯覚】
❶〔知覚の間違い〕an illusion；〔幻覚，妄想〕a hallucination
錯覚を起こす
have [be under] an illusion／be subject to hallucinations
目の錯覚で丸く見えたのです
It looked round because of an optical illusion.
一瞬外国にいるような錯覚を起こした
I was momentarily under the illusion that I was in a foreign country.
❷〔思い違い〕a mistake; a mistaken impression
彼を弟さんだと錯覚した
I mistook him for his brother.