hold (something) inside (of oneself)
To not share or release something related to one's emotions. I wanted to hold my tears inside of myself at the funeral, but I was blubbering in no time. I knew Angela was going through a tough time, so I really tried to hold my happiness inside while I was with her.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
hold something inside
((of) one(self)) Go to hold something in.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.