Under arms describes a state of military readiness (actual or ceremonial). Typically, troops are considered “under arms” when they are in uniform, on duty, and carrying a weapon (rifle, side-arm, or sword), as opposed to being in uniform, on duty, but not carrying a weapon.
Soldiers not actually carrying a weapon but wearing a service belt or web gear associated with carrying weapons may be considered to be symbolically “under arms”.Soldiers normally remove headgear while indoors; however, soldiers who are under arms normally wear their headgear indoors, with a few exceptions.
It’s usually not a medical condition. If your armpit is darker than your normal skin colour, the reasons could be many. Major causes of dark underarms are shaving, use of deodorants and antiperspirants, use of chemicals-loaded hair removing creams, sweat clogging due to poor ventilation etc.
Many people think that the armpits do not take you to further trouble, apart from sweating. But they go frantic when they realize their underarms are slowly turning dark. You’re not alone in this. And remember, there’s always a solution. Here are some of the best ways to get rid of underarm darkness:
Potato: Surprising, isn’t it? Potatoes contain natural bleaching agents. This essential kitchen staple is one of the best natural ways to get rid of dark armpits. Simply rub a potato slice over the dark areas. You can even apply the juice squeezed out from a potato. Leave it for 15-20 minutes and then rinse off with cold water. Repeat the process twice a day until you see the magic!