We all know the word and it's usual definition of a dull, listless, depressed mood; low spirits. There's another part of its definition:
A region of the globe found over the oceans near the equator in the intertropical convergence zone and having weather characterized variously by calm air, light winds, or squalls and thunderstorms. Hurricanes originate in this region.
I found that very interesting. Could apply it to me.