| On some roads, it might be several miles after the last one | 59 |
| On some naval maneuvers, e.g. | 29 |
| On solid ground | 15 |
| On Social Security: Abbr. | 25 |
| On Social Security, typically (abbr.) | 37 |
| On Social Security, say: Abbr. | 30 |
| On Social Sec., say | 19 |
| On Social Sec. | 14 |
| On Soc. Security, say | 21 |
| On Soc. Sec., typically | 23 |
| On Soc. Sec., say | 17 |
| On Soc. Sec., perhaps | 21 |
| On Soc. Sec., often | 19 |
| On Soc. Sec., maybe | 19 |
| On Soc. Sec. | 12 |
| On skid row | 11 |
| On sick leave | 13 |
| On short notice | 15 |
| On ship | 7 |
| On sheltered side | 17 |
| On shank's mare | 19 |
| On shaky ground | 15 |
| On second thought, make it an inspirational film: "The Evil Dead..." | 78 |
| On second thought, make it an edgy comedy: "The Unbearable Lightness of Being..." | 91 |
| On second thought, make it an action flick: "Howards End..." | 70 |
| On second thought, make it a romantic comedy: "Soylent Green..." | 74 |
| On second thought, make it a prison drama: "French Kiss..." | 69 |
| On second thought, make it a musical: "Quiz Show..." | 62 |
| On second thought, make it a horror film: "Big Momma's House..." | 78 |
| On second thought, make it a grim futuristic epic: "Zorro, the Gay Blade..." | 86 |
| On second thought, make it a goofball comedy: "The Good Earth..." | 75 |
| On second thought, make it a gangster film: "Charlie's Angels..." | 79 |
| On second thought, make it a family picture: "Dirty Harry..." | 71 |
| On second thought, make it a costume drama: "Stop Making Sense..." | 76 |
| On Saturn, it's about 10 hours | 34 |
| On sale, say | 12 |
| On sale, or taken off sale | 26 |
| On sale now | 11 |
| On sale | 7 |
| On sabbatical, e.g. | 19 |
| On sabbatical | 13 |
| On reserve | 10 |
| On relief | 9 |
| On rare occasions | 17 |
| On ramp | 7 |
| On Quint's Orca, perhaps | 28 |
| On Poseidon's territory | 27 |
| On poor umpiring: "Macbeth" | 37 |
| On point | 8 |
| On pitch | 8 |
| On pins/needles | 15 |
| On pins and needles | 19 |
| On pension: Abbr. | 17 |
| On pension (Abbr.) | 18 |
| On pension | 10 |
| On pens. | 8 |
| On paper | 8 |
| On our trip, we came to a __ ... | 32 |
| On or ___ | 9 |
| On or after | 11 |
| On or about | 11 |
| On open waters | 14 |
| On oneÂ's own | 21 |
| On one's _____ | 18 |
| On one's ____ | 17 |
| On one's ___ (submissive) | 29 |
| On one's ___ (indigent) | 27 |
| On one's ___ (independent) | 30 |
| On one's ___ (destitute) | 28 |
| On one's ___ (broke) | 24 |
| On one's ___ (alert) | 24 |
| On one's ___ | 16 |
| On one's __ (alert) | 23 |
| On one's way out | 20 |
| On one's way | 16 |
| On one's uppers | 19 |
| On one's trolley? | 21 |
| On one's toes | 17 |
| On one's tax return | 23 |
| On one's side | 17 |
| On one's rocker? | 20 |
| On one's rocker, perhaps | 28 |
| On one's rocker | 19 |
| On one's own | 16 |
| On one's mark | 17 |
| On one's last ___ | 21 |
| On one's last legs | 22 |
| On one's keister | 20 |
| On one's guard | 18 |
| On one's game | 17 |
| On one's feet | 17 |
| On one's duff | 17 |
| On one's case | 17 |
| On one's back | 17 |
| On one's --- (independent) | 30 |
| On one side | 11 |
| On one of these pages | 21 |
| On one occasion | 15 |
| On one extreme | 14 |
| On Old Ironsides | 16 |