| outback | (adjective) inaccessible and sparsely populated | Synonyms: remote |
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| (noun) the bush country of the interior of Australia | - |
| outbalance | (verb) weigh more heavily | Synonyms: outweigh, overbalance, preponderate |
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| outbid | (verb) bid higher than others | - |
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| (verb) bid over an opponent's bid when one's partner has not bid or doubled | - |
| outboard | (adjective) located away from the midline of a vessel or aircraft | - |
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| (noun) internal-combustion engine that mounts at stern of small boat | Synonyms: outboard motor |
| (noun) a motorboat with an outboard motor | Synonyms: outboard motorboat |
| outbound | (adjective) that is going out or leaving | Synonyms: departing, outward-bound, outward |
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| outbrave | (verb) be braver than | - |
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| (verb) resist bravely | - |
| outbreak | (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: eruption, irruption |
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| outbred | (adjective) bred of parents not closely related; having parents of different classes or tribes | - |
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| outbuilding | (noun) a building that is subordinate to and separate from a main building | - |
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| outburst | (noun) a sudden violent disturbance | Synonyms: tumultuous disturbance |
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| (noun) an unrestrained expression of emotion | Synonyms: blowup, ebullition, effusion, gush |
| (noun) a sudden intense happening | Synonyms: burst, flare-up |