| in someone's shoes |
| in someone's view |
| in splits |
| inspreken |
| in stride |
| insult one's intelligence |
| in the altogether |
| in the bag |
| in the books |
| in the buff |
| in the cards |
| in the dark |
| in the doghouse |
| in the driver's seat |
| in the fast lane |
| in the first place |
| in the foothills |
| in the game |
| in the groove |
| in the hole |
| in the hospital |
| in the interest of justice |
| in the lead |
| in the limelight |
| in the long run |
| in the lump |
| in the money |
| in the nip |
| in the pink of health |
| in the post |
| in the red |
| in the sack |
| in the same shoes |
| in the spotlight |
| in the streets |
| in the thick of it |
| in the wake of |
| in the wind |
| in the works |
| in the worst way |
| in the zone |
| in thunder |
| into detail |
| in too deep |
| into the wide blue yonder |
| in touch |
| in two shakes |
| in vain |
| in virtue of |
| in wine |
| in words of one syllable |
| in your face |
| iron eagle |
| ironing board |
| is a bear Catholic |
| I take it |
| itchy trigger finger |
| it is what it is |
| it's early days |
| it takes one to know one |
| ivory-thumper |
| I would |
| I can't lie |
| ice-calm |
| ice maiden |
| ice queen |
| I could eat a horse |
| idiot box |
| I don't fancy yours |
| I don't know about that |
| I fear |
| if I'm honest |
| if it works, it works |
| if need be |
| if only |
| if pigs had wings |
| if the shoe fits, wear it |
| I hardly know her |
| I'll be |
| I'll be a monkey's uncle |
| I'll be danged |
| ill health |
| I'm not being funny |
| I'm not telling you |
| I'm telling you |
| in a bake |
| in a box |
| in Abraham's bosom |
| in addition |
| in a fix |
| in a fog |
| in a heartbeat |
| in a league of one's own |
| in all honesty |
| in a major key |
| in a mess |
| in and out |
| in a nutshell |
| in any way, shape, or form |
| in a pickle |