think outside the box

型にはまらない考え方をする、既成概念にとらわれない考え方をする

Ex

• Let’s think outside the box.
• I was always thinking outside the box.

Reference source

• https://hapaeikaiwa.com/2014/03/12/「think-outside-the-box（創意工夫）」の使い方/
• https://trilingue.exblog.jp/4687785/