| conundrum | (noun) a difficult problem | Synonyms: brain-teaser, enigma, riddle |
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| doldrums | (noun) a belt of calms and light winds between the northern and southern trade winds of the Atlantic and Pacific | - |
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| (noun) a state of inactivity (in business or art etc) | Synonyms: stagnancy, stagnation |
| drum | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drumfish |
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| (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: membranophone, tympan |
| (noun) a cylindrical metal container, commonly used for shipping or storage of liquids | Synonyms: metal drum |
| (noun) a hollow cast iron cylinder attached to the wheel that forms part of the brakes | Synonyms: brake drum |
| (noun) the sound of a drum | - |
| (noun) a bulging cylindrical shape; hollow with flat ends | Synonyms: barrel |
| drumbeat | (noun) a vehement and vociferous advocacy of a cause | - |
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| (noun) (military) the beating of a drum as a signal for lowering the flag at sundown | - |
| (noun) the sound made by beating a drum | Synonyms: rataplan, rub-a-dub |
| drumbeater | (noun) a fervent and even militant proponent of something | Synonyms: partisan, zealot |
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| drumfire | (noun) intense and continuous artillery fire | Synonyms: cannonade |
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| drumfish | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drum |
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| drumhead | (noun) a membrane that is stretched taut over a drum | Synonyms: head |
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| drumlin | (noun) a mound of glacial drift | - |
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| drummer | (noun) someone who plays a drum | - |
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| drumming | (noun) the act of playing drums | - |
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| drumstick | (noun) a stick used for playing a drum | - |
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| (noun) the lower joint of the leg of a fowl | - |
| eardrum | (noun) the membrane in the ear that vibrates to sound | Synonyms: myringa, tympanic membrane, tympanum |
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| humdrum | (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
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| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| panjandrum | (noun) an important or influential (and often overbearing) person | Synonyms: dignitary, high-up, high muckamuck, very important person, VIP |
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| quadrumvirate | (noun) a group of four men | - |
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