Like leg, arm is a word that is mostly associated with a body part.
Like being legless, another description for being drunk, being rendered ‘armless’ means you are no threat, in a rather awful but funny way by saying it.
I guess we all have a dash of ‘sick’ humour in all of us.
However, arm can also be used to describe a part of a structure too.
It could also describe the arm of an ‘armchair’.
Arm also means to give people weapons like guns, usually from an armoury.
I’m guessing that a whole lot of people with arms is an army!
You can also say that taking those weapons away would be to disarm them.
It might take the long arm of the law to do it, too.
And to disarm someone doesn’t necessarily mean to take away their arms, but to ‘charm’ them with your wit and humour.
An arm can also be a river or streams tributary, so I could say instead of staying on the main river, I’ll take the ‘named’ arm, but just remember, sometimes this can be dangerous, getting off the main route.
On a boat, there is a yardarm, and this was once used to hang seamen who committed serious crimes such as mutiny.
A call to arms was to declare war,
And lastly, an arm of the defence services could be any one of Army, Navy, Marines or Airforce.
Just steer clear of the Navy for the aforementioned reasons.