under the impression

Idioms  

1. 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]

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Example Sentences

“I was under the impression that FTD was just kind of a fun ‘if you know, you know’ sort of thing,” Hardin said.

From Los Angeles Times • Jun. 26, 2026

I was under the impression that a logical qubit had perfect fidelity.

From Barron's • May 21, 2026

But some children were also under the impression that there had been significant organised fighting or even that people had been killed, for which there's no evidence at all.

From BBC • Mar. 9, 2026

The Miami crowd, under the impression they were there to be entertained, hissed and booed.

From The Wall Street Journal • Dec. 20, 2025

Many people were under the impression that I owned a badly behaved rabbit.”

From "Harry Potter and the Half-Blood Prince" by J.K. Rowling