swallow one's pride - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Humble oneself, as in She decided to swallow her pride and apologize. This idiom employs swallow in the sense of “refrain from expressing,” a usage dating from the early 1600s.