What does 錯覚 mean?
錯覚 is a Japanese noun meaning “illusion” in English. It is written as 錯覚 in kanji, さっかく in hiragana, and sakkaku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
これはあれよりも長いように見えるが、錯覚だ。
This looks longer than that, but it is an optical illusion.