see/hear things

see things

To see visual hallucinations or imagine things that are not really there. There's no dog in the back yard—you're seeing things. I could have sworn the contract said we were entitled to a lower price, but I must have been seeing things.
See also: see, thing
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

hear (or see) things

imagine that you can hear (or see) something that is not in fact there.
See also: hear, thing
Farlex Partner Idioms Dictionary © Farlex 2017

ˈsee/ˈhear things

(informal) see/hear things that are not really there: So it was you that was playing the piano! I thought I was hearing things. ♢ (humorous) Tom’s washing the dishes — I must be seeing things!
See also: hear, see, thing
Farlex Partner Idioms Dictionary © Farlex 2017
See also: