| On even terms, old-style | 24 |
| On either side of the center | 28 |
| On edge, with 'up' | 26 |
| On edge with excitement | 23 |
| On display only: Abbr. | 22 |
| On Cato's calendar | 22 |
| On and on and on and ... | 24 |
| On an opponent's field | 26 |
| On an ocean liner, say | 22 |
| On an ocean liner, perhaps | 26 |
| On an ocean liner, maybe | 24 |
| On an ocean liner, e.g. | 23 |
| On an even ___ (stable) | 23 |
| On an even __ (steady) | 22 |
| On an enforced diet of sorts | 28 |
| On an America's Cup yacht | 29 |
| On all ___ (crawling, say) | 26 |
| On again, as a lantern | 22 |
| ON address, or Disney duck | 26 |
| ON address, or actress Lohan | 28 |
| On a ___-to-know basis | 22 |
| On a voyage on the ocean | 24 |
| On a vessel's left | 22 |
| On a slow boat to China, e.g. | 29 |
| On a slow boat to China | 23 |
| On a shortage of know-how? | 26 |
| On a scale from one -- | 22 |
| On a proportional basis | 23 |
| On a plane, train, or bus | 25 |
| On a plane, train or bus | 24 |
| On a par, in Orléans | 23 |
| On a par with, in France | 24 |
| On a moment's notice | 24 |
| On a menu, for instance | 23 |
| On a lounge chair, maybe | 24 |
| On a long project, perhaps | 26 |
| On a list, in olden times | 25 |
| On a Halloween rampage, say | 27 |
| On a global scale: abbr. | 24 |
| On a dial, they're 6 | 24 |
| On a detective's list | 25 |
| On a Carnival ride, perhaps | 27 |
| On --- with (equal to) | 22 |
| On --- with (comparable to) | 27 |
| On --- (without commitment) | 27 |
| On --- (counting calories) | 26 |
| On -- with (similar to) | 23 |
| On -- with (much like) | 22 |
| On -- with (equivalent) | 23 |
| On -- with (equivalent to) | 26 |
| On -- with (comparable to) | 26 |
| On -- (of equal value) | 22 |
| On -- (equal in value) | 22 |
| On -- (enjoying good luck) | 26 |
| On ___ with (equal to) | 23 |
| Omphaloskepsis impediment? | 26 |
| Omphalophobia fear, perhaps | 27 |
| Omnivorous Colorado critter | 27 |
| Omnivore of stereotypes | 23 |
| Omniscient radio character | 26 |
| Omnipotent one, in Hebrew | 25 |
| Omitted, as from a list | 23 |
| Omitted, as a syllable | 22 |
| Omitted in pronunciation | 24 |
| Omitted cry of approval? | 24 |
| Omits, in pronunciation | 23 |
| Omits in pronunciation | 22 |
| Omission, as of a vowel | 23 |
| Omission of a syllable | 22 |
| Ominous-sounding phrase | 23 |
| Ominous words from the boss | 27 |
| Ominous note from the boss | 26 |
| Ominous end of a threat | 23 |
| Ominous Elliot Smith song | 25 |
| Ominous date for Caesar | 23 |
| Ominous crossers ahead | 22 |
| Omicrons' predecessors | 26 |
| Omicrons' preceders | 23 |
| Omicron's followers | 23 |
| Omicron's big brother | 25 |
| Omicron ___ (the star Mira) | 27 |
| Omertà organization | 22 |
| Omen observer of old Rome | 25 |
| Omen in a weather maxim | 23 |
| Omen in a highbrow Western? | 27 |
| Omelet preparer's need | 26 |
| Omelet maker's gadget | 25 |
| Omelet ingredient, maybe | 24 |
| OmegaÂ's opposite | 25 |
| Omega, to an electrician | 24 |
| Omega's predecessor | 23 |
| Omega's counterpart | 23 |
| Omega's antithesis | 22 |
| Ombrometers measure them | 24 |
| Omar's inverted Bowl | 24 |
| Omar's comrade-in-arms | 26 |
| Omar Sharif's homeland | 26 |
| Omar of "Scream 2" | 28 |
| Omar of "House" | 25 |
| Omar of "ER" | 22 |