Question

what are Doldrums why are they called so?

Answer 1

The doldrums is a colloquial expression derived from historical maritime usage, which refers to those parts of the Atlantic Ocean and the Pacific Ocean affected by a low-pressure area around the equator where the prevailing winds are calm.

Answer 2

while crossing the Equator, sailors in the 1700's would often get their boats stuck due to lack of wind . They called this area the doldrums..