can't hold it (in)
No longer able to prevent oneself from urinating. I tried to sit through the rest of the movie, but I just couldn't hold it anymore and raced out of the theater to use the bathroom. Daddy, I need to go to the bathroom, and I can't hold it in until we get home! There's always one poor "potty-trained" preschooler who discovers they can't, in fact, hold it in during show and tell.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.