| inchmeal | | | |
| inch-perfect | | | |
| inch up | | | |
| inchworm | | | |
| in cold blood | | | |
| in collar | | | |
| in concert | | | |
| in control | | | |
| in deep | | | |
| in detail | | | |
| Indian sign | | | |
| in diapers | | | |
| in Dickie's meadow | | | |
| indict a ham sandwich | | | |
| in droves | | | |
| in Dutch | | | |
| in effigy | | | |
| I never did | | | |
| I never miss | | | |
| in every sense of the word | | | |
| in evidence | | | |
| in fee | | | |
| in fighting trim | | | |
| in focus | | | |
| in for a dime, in for a dollar | | | |
| in for an inch, in for a mile | | | |
| in for a penny, in for a pound | | | |
| in for it | | | |
| in for the kill | | | |
| in front of one's nose | | | |
| in full force | | | |
| in full gear | | | |
| in good odor | | | |
| in good sorts | | | |
| in harness | | | |
| in heaven's name | | | |
| in high dudgeon | | | |
| in high gear | | | |
| in hot pursuit | | | |
| in jest | | | |
| in jig time | | | |
| ink in | | | |
| in kind | | | |
| in layman's terms | | | |
| in layperson's terms | | | |
| in laywoman's terms | | | |
| in light of | | | |
| in line | | | |
| in living memory | | | |
| inner circle | | | |
| inner ear | | | |
| inner strength | | | |
| in no small measure | | | |
| in no small part | | | |
| in nothing flat | | | |
| in no time | | | |
| in no uncertain terms | | | |
| in no way, shape, or form | | | |
| in on | | | |
| in one bite | | | |
| in one foul swoop | | | |
| in one go | | | |
| in one's altitudes | | | |
| in one's back pocket | | | |
| in one's bare skin | | | |
| in one's bones | | | |
| in one's cups | | | |
| in one's dreams | | | |
| in one's head | | | |
| in one's hip pocket | | | |
| in one's own good time | | | |
| in one's own little way | | | |
| in one's pocket | | | |
| in one's right mind | | | |
| in one's wildest dreams | | | |
| in order | | | |
| in other news | | | |
| in other words | | | |
| in pampers | | | |
| in plain sight | | | |
| in plain view | | | |
| in rare form | | | |
| in reaction | | | |
| in recent memory | | | |
| in record time | | | |
| in retreat | | | |
| in safe hands | | | |
| ins and outs | | | |
| in shape | | | |
| in short pants | | | |
| in short trousers | | | |
| inside baseball | | | |
| inside job | | | |
| inside joke | | | |
| inside out | | | |
| inside scoop | | | |
| inside the box | | | |
| in someone's black books | | | |
| in someone's face | | | |
| in someone's pocket | | | |