The doldrums are being sad and blue. Feeling depressed and
uninspired.
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The high solar intensity at equatorial latitudes causes
intense heating at the equator, which produces powerful
convection currents called Prevailing Winds. The Doldrums are where
the prevailing winds at the Equator die.
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The ship got to the doldrums where there was no wind.
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the doldrums
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The word "doldrums" is a noun. It refers to a state of inactivity, stagnation, or low spirits.