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]

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