1.
to be thinking about sth that is not connected with what you are doing
2.
to have ideas, plans, etc. that are not realistic
1.
to be thinking about sth that is not connected with what you are doing
2.
to have ideas, plans, etc. that are not realistic
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005