A singular form occasionally used for one of the doldrums; a state of inactivity, depression, or a region of calm seas.
From 'doldrums' (plural), whose origin is uncertain but possibly connected to 'dull' or dialectal 'dold.' 'Doldrum' as a singular is rare and typically used poetically or historically.
Sailors feared the doldrums because their ships would get stuck in windless zones for weeks—it's the origin of the phrase 'in the doldrums' meaning stuck and depressed!
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