under the impression


Also found in: Acronyms.

under the impression

Thinking, assuming, or believing something, as in I was under the impression that they were coming today. This idiom often suggests that the idea or belief one had is mistaken. [Mid-1800s]
See also: impression
References in classic literature ?
The sergeant, I may add, is under the impression that there were two men in the boat.
If I had not joined you when I did, you would have been examined and cross-examined about yourself and about me, and you would innocently have answered under the impression that you were speaking to a chance acquaintance.