be under the impression that...

be under the impression that

To be living, operating, or functioning with the belief in that something is true. Jeremy's always been under the impression that he's a great writer, even though he's never written more than a few crummy poems. Oh, I was under the impression that we were meeting at two—did that change?
See also: impression, that

be under the imˈpression that...

believe, usually wrongly, that...: I was under the impression you were coming tomorrow, not today.
See also: impression