Definition of "under the impression" [under the impression]

• Thinking or making assumptions, often incorrectly. (adverb)

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• "My mom, Annabeth Ellis, assistant manager of Quill Stationers, was under the impression that my life was lacking things—things like more friends, places to go, stuff to do, a passion, a boyfriend, maybe."
• "Alis's other classes had been fibe-op-feed lectures, and her roommate, very splatted, was under the impression Alis had gone back home."
• "NOTE: At the time my book was going through the press, I was under the impression that the fish known in this country as a Sucker was the same as the Mullet, but had no intention that the latter name should find its way into the text in place of Sucker."