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

Some cycling advocates say they were under the impression additional vouchers — that would have been funded by the subsequent $18 million in state funding — were on the horizon as soon as a new administrator of the program was secured.

From Los Angeles Times

“I’ve never met a Berserker. I was under the impression they were all dead.”

From Literature

The couple said they were under the impression they were being compensated to be actors in a movie.

From Los Angeles Times

Although Carol was under the impression that she had to give the Others consent to harvest the stem cells that they need to concoct an assimilating formula, the genetic material from the eggs she froze before the Joining, which they’ve obtained, is sufficient.

From Salon

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

From The Wall Street Journal