1.
on the sea, especially in a ship, or in the sea :
It happened on the second night at sea.
They were lost at sea .
2.
confused and not knowing what to do :
I'm all at sea with these new regulations.
1.
on the sea, especially in a ship, or in the sea :
It happened on the second night at sea.
They were lost at sea .
2.
confused and not knowing what to do :
I'm all at sea with these new regulations.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005