| In the 90s | 10 |
| In the 90s, weatherwise | 23 |
| In the act | 10 |
| In the afternoon, in British military slang | 43 |
| In the air | 10 |
| In the altogether | 17 |
| In the appropriate way | 22 |
| In the area | 11 |
| In the area where "The Fantasticks" is a hit | 54 |
| In the area: Abbr. | 18 |
| In the arms of Morpheus | 23 |
| In the Army for three yrs. | 26 |
| In the ascendant | 16 |
| In the attic | 12 |
| In the attic, e.g. | 18 |
| In the attic, maybe | 19 |
| In the back | 11 |
| In the back of the boat | 23 |
| In the back, nautically speaking | 32 |
| In the background | 17 |
| In the background, perhaps | 26 |
| In the backstroke position | 26 |
| In the bag | 10 |
| In the bag, as a victory | 24 |
| In the bag, with "up" | 31 |
| In the ball park | 16 |
| In the ballpark | 15 |
| In the bank | 11 |
| In the baroque style | 20 |
| In the basement | 15 |
| In the beaver state? | 20 |
| In the beginning | 16 |
| In the best case | 16 |
| In the best case scenario | 25 |
| In the best of all possible worlds | 34 |
| In the best shape | 17 |
| In the best way | 15 |
| In the best- or worst-case scenario | 35 |
| In the Bible, Ruth's mother-in-law | 38 |
| In the black | 12 |
| In the black again | 18 |
| In the black, as businesses | 27 |
| In the black, like a dry cleaner? | 33 |
| In the black, metaphorically | 28 |
| In the Black, say | 17 |
| In the Black? | 13 |
| In the blink of --- | 19 |
| In the blink of an orb? | 23 |
| In the blink of __ | 18 |
| In the blink of ___ | 19 |
| In the blink __ eye | 19 |
| In the blink ___ eye | 20 |
| In the book | 11 |
| In the boondocks | 16 |
| In the boondocks, e.g. | 22 |
| In the bow | 10 |
| In the box | 10 |
| In the box, at Shea | 19 |
| In the brain, so to speak | 25 |
| In the brain, to a Brit | 23 |
| In the bucks | 12 |
| In the buff | 11 |
| In the buff? | 12 |
| In the building | 15 |
| In the bullpen | 14 |
| In the calaboose | 16 |
| In the capacity of | 18 |
| In the cards | 12 |
| In the cargo hold, say | 22 |
| In the case of | 14 |
| In the cast | 11 |
| In the catbird seat | 19 |
| In the catbird ___ | 18 |
| In the cellar | 13 |
| In the cellar, in sports | 24 |
| In the cellar, so to speak | 26 |
| In the cellar, sportswise | 25 |
| In the center | 13 |
| In the center of | 16 |
| In the centre of | 16 |
| In the chips | 12 |
| In the class | 12 |
| In the class of | 15 |
| In the clear | 12 |
| In the clink | 12 |
| In the closet, say | 18 |
| In the cloud, perhaps? | 22 |
| In the clouds | 13 |
| In the comic strip "Blondie," Lou's is one | 56 |
| In the company of | 17 |
| In the company? | 15 |
| In the con camp | 15 |
| In the continental U.S. | 23 |
| In the cooler | 13 |
| In the corner, maybe | 20 |
| In the correct way | 18 |
| In the course of | 16 |
| In the course of many weeks | 27 |
| In the crib | 11 |
| In the crosshairs | 17 |