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1.
According to Dr. Chris Turk, surgeon in Sacred Heart hospital, it means: someone who is guilty of a lie of omission.
He calls his wife a lie-omitter.
Carla: okay, maybe I'm guilty of a lie of omission.
Turk: Cause you're a lie-omitter!
by MeliorMelusine June 04, 2011
 
2.
Someone who doesn't outwardly lie but omits the truth or changes the subject in order to convey a false impression.
She is a lieomitter. She never told me that...
by Pritchie November 29, 2007