Important Idioms and Phrases starting with Alphabet-U
| S.No. | Idioms/Phrases | Meaning |
| 1. | Under the nose of | Right in front of someone |
| 2. | Under the thumb of | Under the power or influence of |
| 3. | Up and doing | Active in work |
| 4. | Up one’s sleeves | An item kept hidden and used whenever required |
| 5. | Uphill task | Difficult task |
| 6. | Upon one’s sweet will | On self-desire or wish |
| 7. | Ups and downs | Good and bad times |
| 8. | Utopian scheme | A visionary scheme though Impractical |