be miles away

be miles away

To be noticeably distracted and unfocused. Of course you don't remember me saying that—you were miles away the whole time! It's the last day before Christmas break, so my students are miles away.
See also: away, mile
Farlex Dictionary of Idioms.

be miles away

be lost in thought and so unaware of what is happening around you. informal
See also: away, mile
Farlex Partner Idioms Dictionary

be ˈmiles away

(informal) be thinking deeply about something and not aware of what is happening around you: When I ask him a question in class, he just looks at me. He’s always miles away. ‘What do you think of Anne’s idea, Dan?’ ‘Sorry, I was miles away. What idea is that?’
See also: away, mile
Farlex Partner Idioms Dictionary
See also:
  • a million miles away
  • million miles away
  • space someone out
  • spaced out
  • space off
  • second cousin
  • crump
  • occupy (someone or oneself) by (doing something)
  • it escapes (one)
  • occupy with