be miles away
US /biː maɪlz əˈweɪ/
UK /biː maɪlz əˈweɪ/

1.
딴생각을 하다, 정신이 팔려 있다
to be thinking about something else and not paying attention to what is happening around you
:
•
I tried talking to him, but he was miles away.
그에게 말을 걸려고 했지만, 그는 딴생각을 하고 있었다.
•
She must have been miles away, because she didn't hear a word I said.
그녀는 내가 한 말을 한마디도 듣지 못했으니 딴생각을 하고 있었던 게 분명해.