| In bad company, to Ambrose Bierce | 33 |
| In bad condition | 16 |
| In bad faith | 12 |
| In bad health | 13 |
| In bad shape | 12 |
| In bad ___ | 10 |
| In bad ___ (out of favor) | 25 |
| In balance | 10 |
| In baroque style | 16 |
| In Bartlett's, e.g. | 23 |
| In base 8 | 9 |
| In base eight | 13 |
| In baseball, a good one is low | 30 |
| In baseball, he's The Man | 29 |
| In battle | 9 |
| In bed all day, maybe | 21 |
| In bed, maybe | 13 |
| In being | 8 |
| In being: L. | 12 |
| In best shape | 13 |
| In better condition, to collectors | 34 |
| In better fighting shape | 24 |
| In better health | 16 |
| In better order | 15 |
| In better physical condition | 28 |
| In better shape | 15 |
| In better taste | 15 |
| In between | 10 |
| In between jobs | 15 |
| In between ports | 16 |
| In between the mis and the sols | 31 |
| In between, quaintly | 20 |
| In big bits | 11 |
| In big trouble | 14 |
| In big trouble, slangily | 24 |
| In billiards, what the English call English | 43 |
| In biology, it's applied to a genus | 39 |
| In bits and pieces | 18 |
| In bits and pieces, as documents | 32 |
| In bloom | 8 |
| In bluenosed fashion | 20 |
| In bondage | 10 |
| In boots, e.g. | 14 |
| In Boston, they are Red | 23 |
| In Boston, this makes a god out of a guard | 42 |
| In both directions | 18 |
| In bounds | 9 |
| In bounds? | 10 |
| In boxing shape | 15 |
| In brackets | 11 |
| In braids | 9 |
| In bridge, diamonds or clubs | 28 |
| In bridge, the player on the dealer's right | 47 |
| In brief | 8 |
| In brilliant fashion | 20 |
| In Britain they're called thieves' kitchens | 51 |
| In Britain, 39.37 inches | 24 |
| In British lingo, it's stingo | 33 |
| In broad and noble style | 24 |
| In broad daylight | 17 |
| In brogans, e.g. | 16 |
| In Buffett's league | 23 |
| In bundles | 10 |
| In bundles, as hay | 18 |
| In business | 11 |
| In business as of | 17 |
| In business right now | 21 |
| In bygone days | 14 |
| In bygone times | 15 |
| In cahoots | 10 |
| In cahoots w/Warner or Elektra at various points | 48 |
| In cahoots w/Warner or Elektra, one time or another | 51 |
| In Canada, e.g. | 15 |
| In captivity | 12 |
| In captivity, in a way | 22 |
| In cards, an extra hand | 23 |
| In cartoons, a whistle may follow it | 36 |
| In case | 7 |
| In case it happens differently | 30 |
| In case it's called for | 27 |
| In case it's true | 21 |
| In case that | 12 |
| In case that's true | 23 |
| In certain areas it's called Radio Nord Québec | 53 |
| In certain nightwear | 20 |
| In chains | 9 |
| In chaotic disorder | 19 |
| In charge | 9 |
| In charge at home | 17 |
| In charge of | 12 |
| In charge of genealogy? | 23 |
| In charge, as in a family | 25 |
| In check | 8 |
| In cipher | 9 |
| In ciphertext | 13 |
| In circulation | 14 |
| In circulation, as a newspaper | 30 |
| In class | 8 |
| In class, they can be taken or taken away | 41 |
| In Cleveland, I am on dusty infield (7) | 39 |