Here is a list of irregular verbs beginning with U.
| Base Form | Past Form | Past Participle |
|---|
| unbend | unbent | unbent |
| underbid | underbid | underbid |
| undercut | undercut | undercut |
| underdo | underdid | underdone |
| underfeed | underfed | underfed |
| undergo | underwent | undergone |
| underlie | underlay | underlain |
| underpay | underpaid | underpaid |
| undersell | undersold | undersold |
| underspend | underspent | underspent |
| understand | understood | understood |
| undertake | undertook | undertaken |
| underwrite | underwrote | underwritten |
| undo | undid | undone |
| unlearn | unlearnt | unlearnt |
| unlearned | unlearned |
| unmake | unmade | unmade |
| unsay | unsaid | unsaid |
| unwind | unwound | unwound |
| uphold | upheld | upheld |
| upset | upset | upset |
