витать в облаках

витать в облаках  {v. phr.}  {informal}
To be absent-minded, laid-back; think about something different than what is being said.
Compare: to be up in the clouds, to have one's head in the clouds.
Your son always has his head in the clouds during the lessons. — Ваш сын постоянно витает в облаках на уроках.
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