read between the lines
US /riːd bɪˈtwiːn ðə laɪnz/
UK /riːd bɪˈtwiːn ðə laɪnz/

1.
행간을 읽다, 숨겨진 의미를 파악하다
to understand the hidden meaning in what someone says or writes
:
•
You have to read between the lines to understand what she really means.
그녀가 정말로 무엇을 의미하는지 이해하려면 행간을 읽어야 한다.
•
His letter seemed straightforward, but I could read between the lines that he was unhappy.
그의 편지는 솔직해 보였지만, 나는 그가 불행하다는 것을 행간에서 읽을 수 있었다.