| countdown | (noun) counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle) | - |
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| hotdog | (noun) a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll | Synonyms: dog, frank, frankfurter, hot dog, weenie, wiener, wienerwurst |
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| (noun) a frankfurter served hot on a bun | Synonyms: hot dog, red hot |
| (noun) someone who performs dangerous stunts to attract attention to himself | Synonyms: hot dog |
| letdown | (noun) a feeling of dissatisfaction that results when your expectations are not realized | Synonyms: disappointment |
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| meltdown | (noun) a disaster comparable to a nuclear meltdown | - |
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| (noun) severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping | Synonyms: nuclear meltdown |
| outdo | (verb) be or do something to a greater degree | Synonyms: exceed, outgo, outmatch, outperform, outstrip, surmount, surpass |
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| (verb) get the better of | Synonyms: best, outflank, scoop, trump |
| outdoor | (adjective) located, suited for, or taking place in the open air | Synonyms: out-of-door, outside |
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| (adjective) pertaining to or concerning the outdoors or outdoor activities | - |
| outdoors | (noun) where the air is unconfined | Synonyms: open, open air, out-of-doors |
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| (adverb) outside a building | Synonyms: alfresco, out of doors, outside |
| outdoorsman | (noun) a male person who spends time outdoors (e.g., hunting or fishing) | - |
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| outdoorsperson | (noun) a person who spends time outdoors (e.g., hunting or fishing) | - |
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| outdoorswoman | (noun) a woman who spends time outdoors (e.g., hunting and fishing) | - |
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| outdoorsy | (adjective) characteristic of or suitable to outdoor life | - |
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| postdoc | (noun) a scholar or researcher who is involved in academic study beyond the level of a doctoral degree | Synonyms: post doc |
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| (noun) a grant that funds postdoctoral study or research | Synonyms: post doc, postdoctoral |
| postdoctoral | (adjective) of or relating to study or research that is done after work for the doctoral degree has been completed | - |
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| (noun) a grant that funds postdoctoral study or research | Synonyms: post doc, postdoc |
| putdownable | (adjective) (of a book) poorly written and not entertaining | - |
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| shutdown | (noun) termination of operations | Synonyms: closedown, closing, closure |
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