be a figment of (one's/the) imagination

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.
See also: figment, imagination, of
Farlex Dictionary of Idioms.
See also:
  • figment
  • imagination
  • figment of (one's)/the imagination
  • figment of one's imagination
  • a figment of somebody's imagination
  • there is no spoon
  • the mind's ear
  • by no stretch
  • be on the door
  • answer the door