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seeing things

Experiencing hallucinations or delusions, as in I thought I saw my father, but I must have been seeing things; he died twenty years ago. [First half of 1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.