| In the habit of | 15 |
| In the hands of | 15 |
| In the hay, so to speak | 23 |
| In the heart of | 15 |
| In the Heat of the Night setting | 32 |
| In the heavens | 14 |
| In the high 70s | 15 |
| In the high 80s | 15 |
| In the hold | 11 |
| In the hold, asea | 17 |
| In the hold, nautically | 23 |
| In the hold, say | 16 |
| In the hold, to sailors | 23 |
| In the hole | 11 |
| In the home of: Fr. | 19 |
| In the horse latitudes | 22 |
| In the hospital | 15 |
| In the house | 12 |
| In the hub of | 13 |
| In the hull | 11 |
| In the human brain it may be temporal or frontal | 48 |
| In the hunt | 11 |
| In the ideal case | 17 |
| In the immediate area | 21 |
| In the immediate neighborhood? | 30 |
| In the immediate vicinity | 25 |
| In the indefinite future | 24 |
| In the infirmary | 16 |
| In the initial phases | 21 |
| In the interval | 15 |
| In the intervening time | 23 |
| In the know | 11 |
| 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 |