| On the quiet side, nautically | 29 |
| On the qui ___ (watchful) | 25 |
| On the plus side?: Abbr. | 24 |
| On the pathway of futility | 26 |
| On the pathway of enticement | 28 |
| On the path to great success | 28 |
| On the outside: Prefix | 22 |
| On the outs with a relative? | 28 |
| On the other team's turf | 28 |
| On the other hand, briefly | 26 |
| On the organist's mind | 26 |
| On the ocean or in a fog | 24 |
| On the observation deck, say | 28 |
| On the near side: Prefix | 24 |
| On the move on the briny | 24 |
| On the mother's side | 24 |
| On the Most Wanted list | 23 |
| On the mend, in Munich | 22 |
| On the Mediterranean, e.g. | 26 |
| On the market, in a way | 23 |
| On the Love Boat, perhaps | 25 |
| On the Love Boat, e.g. | 22 |
| On the less windy side | 22 |
| On the less blustery side | 25 |
| On the left, on the water | 25 |
| On the left side, nautically | 28 |
| On the left side of a ship | 26 |
| On the horizon, perhaps | 23 |
| On the highest point of | 23 |
| On the high side, as a guess | 28 |
| On the ground, in ballet | 24 |
| On the groom's mind | 23 |
| On the fringes, in a way | 24 |
| On the foul line, ironically | 28 |
| On the edge of one's seat | 29 |
| On the double, when doubled | 27 |
| On the double, poetically | 25 |
| On the double, initially | 24 |
| On the double, in the OR | 24 |
| On the double, in the O.R. | 26 |
| On the double, in memos | 23 |
| On the double, briefly | 22 |
| On the Dead or the Red | 22 |
| On the court's roster | 25 |
| On the clergyman's mind | 27 |
| On the Caribbean, poetically | 28 |
| On the Caribbean, e.g. | 22 |
| On the canvas, informally | 25 |
| On the canvas for good | 22 |
| On the calmer side, at sea | 26 |
| On the calm side, at sea | 24 |
| On the bride's mind | 23 |
| On the best-dressed list | 24 |
| On the ball or on the dot | 25 |
| On the back burner, perhaps | 27 |
| On the Atlantic or Pacific | 26 |
| On the affirmative side | 23 |
| On the 31st of February | 23 |
| On the --- (precisely) | 22 |
| On the -- of (close to) | 23 |
| On the -- (unfriend-ly) | 23 |
| On the -- (hiding out) | 22 |
| On the -- (discreetly) | 22 |
| On the -- (at variance) | 23 |
| On spring's fringe? | 23 |
| On some naval maneuvers, e.g. | 29 |
| On Social Security: Abbr. | 25 |
| On Soc. Sec., typically | 23 |
| On sale, or taken off sale | 26 |
| On Quint's Orca, perhaps | 28 |
| On Poseidon's territory | 27 |
| On one's ___ (submissive) | 29 |
| On one's ___ (indigent) | 27 |
| On one's ___ (destitute) | 28 |
| On one's ___ (broke) | 24 |
| On one's ___ (alert) | 24 |
| On one's __ (alert) | 23 |
| On one's tax return | 23 |
| On one's rocker, perhaps | 28 |
| On one's last legs | 22 |
| On naval maneuvers, in a way | 28 |
| On Mars, this is 687 days | 25 |
| On life support, probably | 25 |
| On leave, for a swabbie | 23 |
| On its way, to oilmen? | 22 |
| On its way, as a message | 24 |
| On its way, as a letter | 23 |
| On its way (or so they say) | 27 |
| On intimate social terms with | 29 |
| On Hollywood Blvd., say | 23 |
| On Hobbits, they make a point | 29 |
| On hand, as a touring troupe | 28 |
| On Golden Pond actor | 23 |
| On fire, in restaurant lingo | 28 |
| On fire, as some desserts | 25 |
| On fire, as a building | 22 |
| On fire in the kitchen | 22 |
| On everyone's mind | 22 |
| On everyone's A-list | 24 |
| On every single occasion | 24 |