When the umbrella is opened its surface is now bigger than if it was closed. If the surface is bigger, the water evaporation will occur faster.
To keep dry.
you need an umbrella to keep dry
Her umbrella acted as a parachute .
He has an umbrella that is not opened.
umbrella
to keep you dry
An umbrella gets wetter but it keeps you dry.
Umbrellas are only considered cursed or unlucky if opened indoors.
it keeps us dry and from getting sick.
In the summertime, an 11' patio umbrella is great for keeping cool in the hot weather. During the half of the year you aren't using your umbrella, however, correctly storing the umbrella is important to avoid mold, odor and damaged fabric. Wipe the umbrella down thoroughly with soap, and dry it until it's free of moisture. If you have a plastic casing, insert it into the case, and store it somewhere dry and dark.
That is just the name they came up with. There is no specific reason. It comes from a Latin word 'Umbra' and its meaning is shade or shaded
hot sun and dry land, hand holding green umbrella.