couldn't
KUUD-nt/ˈkʊd.n̩t/
- 1A short way to say "could not," used to show that something was not possible.
She couldn't find her keys this morning.
We couldn't open the door because it was locked.
Note
Use it in a sentence
Write your own sentence with couldn't, and AI will tell you whether it fits and which meaning you used.
Origin
From "could" plus "n't", the short form of "not".