| In plain view | 13 |
| In play | 7 |
| In play, as a ball | 18 |
| In plentiful amounts | 20 |
| In plenty | 9 |
| In poetry, when she passed, "it seemed like the ceasing of exquisite music" | 85 |
| In poor condition | 17 |
| In poor health | 14 |
| In poor shape | 13 |
| In poor spirits | 15 |
| In poor style | 13 |
| In poor taste | 13 |
| In Poseidon's domain | 24 |
| In Poseidon's realm | 23 |
| In position | 11 |
| In position for a back massage | 30 |
| In position for an inheritance, maybe | 37 |
| In position to inherit the throne, say | 38 |
| In position, as a cornerstone | 29 |
| In position, as a sail | 22 |
| In position, as the British might say | 37 |
| In possession of | 16 |
| In possession of a well-behaved parasite? | 41 |
| In possible danger | 18 |
| In post-career mode: Abbr. | 26 |
| In poverty | 10 |
| In power | 8 |
| In power, as a king | 19 |
| In practice | 11 |
| In pre-swan mode | 16 |
| In precedes Pointe in Michigan | 30 |
| In precisely this way | 21 |
| In preference to | 16 |
| In present condition | 20 |
| In pretty good shape | 20 |
| In prime time, e.g. | 19 |
| In print | 8 |
| In prison | 9 |
| In pristine condition | 21 |
| In pristine condition, perhaps | 30 |
| In private | 10 |
| In process | 10 |
| In profusion | 12 |
| In progress | 11 |
| In progress, to Holmes | 22 |
| In progress, to Sherlock | 24 |
| In proofing, it has a point | 27 |
| In proper harmony | 17 |
| In proper ratio | 15 |
| In proper style | 15 |
| In propinquity | 14 |
| In proportion | 13 |
| In proverbs it's more | 25 |
| In proximity | 12 |
| In proximity to | 15 |
| In public | 9 |
| In pumps, for instance | 22 |
| In pumps, perhaps | 17 |
| In pursuit | 10 |
| In pursuit of | 13 |
| In pursuit of a roof beam designer? | 35 |
| In putting position | 19 |
| In quality? | 11 |
| In quantity | 11 |
| In quarantine | 13 |
| In quest of sea food? | 21 |
| In questionable taste | 21 |
| In quick succession | 19 |
| In random sequence | 18 |
| In ranks | 8 |
| In rapid tempo | 14 |
| In rapid-fire succession | 24 |
| In rapture | 10 |
| In re | 5 |
| In re: | 6 |
| In re: Abbr. | 12 |
| In readiness | 12 |
| In real time | 12 |
| In real trouble | 15 |
| In reality | 10 |
| In reality, it can't be flown | 33 |
| In recent days | 14 |
| In recent memory | 16 |
| In recent times | 15 |
| In reference to | 15 |
| In regard | 9 |
| In regard to | 12 |
| In regular installments | 23 |
| In relation to | 14 |
| In relation to, for short | 25 |
| In relief | 9 |
| In remembrance of the past | 26 |
| In reply | 8 |
| In repose | 9 |
| In reserve | 10 |
| In reserve (slang) | 18 |
| In reserve Weakerthans tune? | 28 |
| In reserve, as money | 20 |
| In reserve, or cinched | 22 |
| In respect to, with ''of'' | 42 |