Important Idioms and Phrases starting with Alphabet- I
| S.No. | Idioms/Phrases | Meaning |
| 1. | In a nutshell | In very brief form |
| 2. | In black and white | In printed or written form |
| 3. | In full swing | At the height of activity |
| 4. | In the blues | In dumps depressed |
| 5. | In the long run | Ultimately |
| 6. | In the nick of time | At the last possible moment |
| 7. | In the same boat | Sharing the same problems |
| 8. | In vogue | In the current fashions |
| 9. | Ins and outs | Intricacies or complications/ full detail |
| 10. | Iron hand/ Iron fist | Rigorous control |
| 11. | Itching palm | Craving for bribe |
| 12. | Itsy bitsy | Very small or tiny |