see double

See two images of one object, either as an illusion or owing to some visual aberration, especially one caused by intoxication. For example, Those twins look so much alike they make me think I'm seeing double, or One more drink and I'll be seeing double. This idiom was first recorded in 1628.

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