| In the know about | 17 |
| In the know, daddy-o | 20 |
| In the know, in old slang | 25 |
| In the know, informally | 23 |
| In the know, old-style | 22 |
| In the know, totally | 20 |
| In the Land of Nod | 18 |
| In the lap of the ___ | 21 |
| In the last little while | 24 |
| In the last month: Abbr. | 24 |
| In the lead | 11 |
| In the league's cellar | 26 |
| In the least | 12 |
| In the least bit | 16 |
| In the least favorable case | 27 |
| In the limelight | 16 |
| In the log, say | 15 |
| In the loop | 11 |
| In the loop, with "in" | 32 |
| In the low 90s? | 15 |
| In the lowest possible tax bracket | 34 |
| In the Mafia | 12 |
| In the mail | 11 |
| In the main | 11 |
| In the main stem of a plant | 27 |
| In the main? | 12 |
| In the majority? | 16 |
| In the manner mentioned | 23 |
| In the manner of | 16 |
| In the manner of a brewed beverage | 34 |
| In the manner of a judge | 24 |
| In the manner of a milquetoast | 30 |
| In the manner of a slacker | 26 |
| In the manner of a tortoise | 27 |
| In the manner of ancient Greeks | 31 |
| In the manner of Bryan | 22 |
| In the manner of grub | 21 |
| In the manner of the U.S. Government | 36 |
| In the manner of, on a menu | 27 |
| In the manner of: Suffixes | 26 |
| In the matter of | 16 |
| In the meaning of | 17 |
| In the meantime | 15 |
| In the middle | 13 |
| In the middle of | 16 |
| In the middle of a hot streak | 29 |
| In the middle of a sentence | 27 |
| In the middle of a slow drop-off? | 33 |
| In the middle of lusting, coveting, etc. | 40 |
| In the middle of, in dialect | 28 |
| In the middle of, poetically | 28 |
| In the middle of, quaintly | 26 |
| In the middle, in dialect | 25 |
| In the middle: Abbr. | 20 |
| In the middle: Comb. form | 25 |
| In the middle: Prefix | 21 |
| In the midst of | 15 |
| In the midst of, poetically | 27 |
| In the midst of: Abbr. | 22 |
| In the mil. by choice | 21 |
| In the mind | 11 |
| In the minority | 15 |
| In the minority? | 16 |
| In the mix with | 15 |
| In the money | 12 |
| In the month preceding this one | 31 |
| In the mood | 11 |
| In the most basic way | 21 |
| In the most desperate way | 25 |
| In the most favorable spot | 26 |
| In the movies | 13 |
| In the natural state | 20 |
| In the near future | 18 |
| In the near future, in the past | 31 |
| In the near future, politically | 31 |
| In the neighborhood | 19 |
| In the neighborhood of | 22 |
| In the neighborhood, say | 24 |
| In the netherworld | 18 |
| In the news | 11 |
| In the next couple minutes | 26 |
| In the next few minutes | 23 |
| In the next place | 17 |
| In the nick of time | 19 |
| In the not-too-distant future | 29 |
| In the ocean's direction | 28 |
| In the offing | 13 |
| In the old days | 15 |
| In the olden days | 17 |
| In the on-deck circle | 21 |
| In the open | 11 |
| In the open as a pool | 22 |
| In the open air | 15 |
| In the open, as beliefs | 23 |
| In the opposite direction | 25 |
| In the opposite order | 21 |
| In the order mentioned: Abbr. | 29 |
| In the pact | 11 |
| In the parking lot Mr. Ridder _____ | 35 |
| In the past | 11 |