| Text | Length |
| In clogs, perhaps | 17 |
| In close combat | 15 |
| In close competition | 20 |
| In close order | 14 |
| In close proximity | 18 |
| In close pursuit | 16 |
| In closest proximity | 20 |
| In clover | 9 |
| In coarse fashion | 17 |
| In coastal Maine | 16 |
| In code | 7 |
| In code, perhaps | 16 |
| In coils | 8 |
| In color | 8 |
| In combat | 9 |
| In comics, it's represented by a string of Z's | 54 |
| In command | 10 |
| In command of | 13 |
| In company | 10 |
| In company (with) | 17 |
| In company with | 15 |
| In comparable shape | 19 |
| In comparison (to) | 18 |
| In comparison with | 18 |
| In competition | 14 |
| In complete disorder | 20 |
| In compliance | 13 |
| In computer science, a characterization of every possible solution to a problem | 79 |
| In concealment | 14 |
| In concert | 10 |
| In conclusion | 13 |
| In conclusion, in Cannes | 24 |
| In conclusion: Fr. | 18 |
| In concord | 10 |
| In concord (with) | 17 |
| In concurrence | 14 |
| In condensed form | 17 |
| In condensed format | 19 |
| In conference | 13 |
| In conflict | 11 |
| In conflict with | 16 |
| In conflict with, with "of" | 37 |
| In conformity with | 18 |
| In confrontation | 16 |
| In confused haste | 17 |
| In confusion | 12 |
| In conjunction | 14 |
| In connection with | 18 |
| In consecutive order | 20 |
| In consequence of which | 23 |
| In constant motion | 18 |
| In contact with | 15 |
| In contempt of | 14 |
| In contention | 13 |
| In contradiction to, with “with” | 40 |
| In contrast to | 14 |
| In control | 10 |
| In control, again | 17 |
| In control, in a way | 20 |
| In copious amounts | 18 |
| In cornrows | 11 |
| In costume | 10 |
| In Cousteau's realm | 23 |
| In crowd | 8 |
| In crude style | 14 |
| In crystal form, it's rock candy | 36 |
| In cubbyholes | 13 |
| In current times | 16 |
| In custody | 10 |
| In custody of, as a library patron | 34 |
| In cut time, musically | 22 |
| In danger | 9 |
| In danger at layoff time, perhaps | 33 |
| In danger of | 12 |
| In danger of being drafted | 26 |
| In danger of being sued | 23 |
| In danger of falling off | 24 |
| In danger of snapping | 21 |
| In darkness | 11 |
| In days ahead | 13 |
| In days gone by | 15 |
| In days of --- | 14 |
| In days of knights? | 19 |
| In days of old | 14 |
| In days of yore | 15 |
| In days of ___ | 14 |
| In days of ___ (in times past) | 30 |
| In days past | 12 |
| In debt | 7 |
| In debt due to an inaccurate tax return? | 40 |
| In debt no more | 15 |
| In debt up to one's eyeballs | 32 |
| In decent shape | 15 |
| In decline | 10 |
| In deep trouble | 15 |
| In deep water? | 14 |
| In demand | 9 |
| In der ___ (close by, in Bonn) | 30 |
| In Design measurement | 21 |
| In desperate need of a towel | 28 |
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