be a figment of (one's/the) imagination(redirected from be a figment of their imaginations)
be a figment of (one's/the) imagination
To be an imagined experience (especially after one has initially thought it to be real). I thought I heard the sound of my front door opening last night but it turned out to be a figment of my imagination.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.