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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]

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Words nearby under the impression

under the aegis of, under the circumstances, under-the-counter, under the gun, under the hammer, under the impression, under the influence, under the knife, under the sun, under-the-table, under the weather
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.