| Increase the setting of in slang, | 33 |
| Increase the price of, at auction | 33 |
| Increase the price of, at an auction | 36 |
| Increase the price of at auction | 32 |
| Increase the power of, as an engine | 35 |
| Increase the intensity, with "up" | 43 |
| Increase the appeal of, with "up" | 43 |
| Increase quickly, with "up" | 37 |
| Increase one's offer, as in negotiations | 44 |
| Increase one's home's value, in a way | 45 |
| Increase in strength, with "up" | 41 |
| Increase in perfect basketball shots? | 37 |
| Increase in intensity, with "up" | 42 |
| Increase in increments, with "up" | 43 |
| Increase gradually, with "up" | 39 |
| Incorporated into one's domain | 34 |
| Incorporate, as a YouTube video into a Web site | 47 |
| Incorporate, as a picture in a blog | 35 |
| Incorporate into a city, as territory | 37 |
| Inconsistently applied criterion | 32 |
| Incongruous-sounding high-end stationery | 40 |
| Incongruous juxtaposition of a sort | 35 |
| Incompetent leaders' domains? | 33 |
| Incomparably, after "by" | 34 |
| Incoming administration's to-do list | 40 |
| Income source in the retail business | 36 |
| Income source for seniors, for short | 36 |
| Income source for a radio station | 33 |
| Income provided by the U.S. govt. | 33 |
| Incognito traveler's invention | 34 |
| Inclusion with a manuscript (Abbr.) | 35 |
| Inclusion in many a boathouse rental | 36 |
| Including, as pertinent information | 35 |
| Including the latest information | 32 |
| Including Monopoly money in a trousseau? | 40 |
| Includes in an e-mail, as a mgr. | 32 |
| Included on the e-mail list, for short | 38 |
| Included on an email, not-so-secretly | 37 |
| Included in an online correspondence | 36 |
| Include, so as to sweeten the pot | 33 |
| Include secretly, as in an email exchange | 41 |
| Include secretly, as in an email | 32 |
| Include secretly in an email, say | 33 |
| Include discreetly a Yankees ace on an e-mail? | 46 |
| Include a document, as with an email | 36 |
| Inclination to see the glass half full | 38 |
| Inclement, as some wintry weather | 33 |
| Incite to attack, with "on" | 37 |
| Incidentally, in texting shorthand | 34 |
| Incidentally, in online shorthand | 33 |
| Incidentally, in e-mail shorthand | 33 |
| Incidentally, in chat room shorthand | 36 |
| Incident involving a missing lab vessel? | 40 |
| Incessantly contemplate something | 33 |
| Incense (with "stick") | 32 |
| Incendiary fuel in "Apocalypse Now" | 45 |
| Incas' victims: 15th century | 32 |
| Incas' origin, in their mythology | 37 |
| Incarnation of the Egyptian god Thoth | 37 |
| Incarceration for certain offenders | 35 |
| Incarcerated leader of the Gambino crime family | 47 |
| Incapable of even trying a combover | 35 |
| Incapable of being detected, in a way | 37 |
| Inca ___ (popular Peruvian soft drink) | 38 |
| Inc.'s across-the-pond counterpart | 38 |
| Inaugural Rock and Roll Hall of Fame inductee | 45 |
| Inaugural baseball Hall of Famer Ty | 35 |
| Inarticulate expression of disbelief | 36 |
| Inappropriately used therapeutic jargon | 39 |
| Inappropriate for the easily offended, say | 42 |
| Inappropriate for high-class Brits | 34 |
| Inadvisable thing to do, usually, in the mail | 45 |
| Inadvertently destructive sort, literally | 41 |
| Inadmissible testimony of a sort | 32 |
| Inaccurate verb in a toy's name | 35 |
| Inaccurate info on many online dating profiles | 46 |
| Inability to tell A from B, e.g. | 32 |
| Inability to stay focused, briefly | 34 |
| Inability to see Fido's neckwear? | 37 |
| Inability to recognize and name objects | 39 |
| Inability to recall the names of objects | 40 |
| Inability to name everyday objects | 34 |
| Inability to go when others are around | 38 |
| Inability to get A's or B's? | 36 |
| Inability to distinguish different pitches | 42 |
| In-your-face '50s-'60s talk show host Joe | 49 |
| In-state opponent of a 'Cane | 32 |
| In-house computer linkup, briefly | 33 |
| In-flight guesstimate, for short | 32 |
| In-flight entertainment, for short | 34 |
| In-flight announcements, for short | 34 |
| In-flight announcement, for short | 33 |
| In-box item on one's birthday | 33 |
| In _____ signo vinces (ancient motto) | 37 |
| In ___, you might see some ___ hanging around | 45 |
| In ___, plenty of ___ is growing | 32 |
| In ___ parentis (legal doctrine) | 32 |
| In ___ of (as a replacement for) | 32 |
| In ___ (within a living organism) | 33 |
| In ___ (stuck in the same routine) | 34 |