1. an excessively high opinion of oneself; conceit
Usage: informal
2. a disease of fish and other animals characterized by swelling of the head
Usage: veterinary

Examples

• Don’t get a bighead just because you won one game.
• His success gave him a terrible bighead.
• She accused him of having a bighead after his promotion.
• The coach warned the players not to develop a bighead.
• The fish showed symptoms of bighead disease.
• Bighead is common in carp populations.