an inordinately grand opinion of oneself; conceit.
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- swell box,
- swell front,
- swelled head, have a,
Origin of swelled head
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
informal an inflated view of one's own worth, often caused by sudden success
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012