Bait Definition of Bait by Merriam Webster Bait definition is to persecute or exasperate with unjust, malicious, or persistent attacks to try to make angry with criticism or insults How to use bait in a sentence Synonym Discussion of bait. Bait definition of bait by The Free Dictionary bait b t n a Food or other lure placed on a hook or in a trap and used in the taking of fish, birds, or other animals b Something, such as a worm, used for this purpose An enticement, temptation, or pro