You have to look at context. Look at the definition of right
Right-
Adjective
1. morally good, justified, or acceptable.
2. true or correct as a fact.
Adverb
1. to the furthest or most complete extent or degree (used for emphasis).
2. correctly
Noun
1. that which is morally correct, just, or honorable.
2. a moral or legal entitlement to have or obtain something or to act in a certain way.
Verb
1. restore to a normal or upright position.
Exclamation-informal
1. used to indicate one's agreement with a suggestion or to acknowledge a statement or order.
Bear-
Verb
1. (of a person) carry
EX: he was bearing a tray of brimming glasses"
2. support
EX: walls that cannot bear a stone vault"synonyms:support,*carry,*hold up,*prop up*
3. endure (an ordeal or difficulty)
EX: she bore the pain stoically"
4. give birth to (a child).
5. turn and proceed in a specified direction
It would be difficult to understand if you take it all out of context, so I will play along.
The right (meaning moral good) to bear (carry) arms (human appendages between shoulders and hands) must not be infringed. Uh does this mean that it's moral not to cut off your arms and then there is this carry part, makes no real sense. Especially when you add in the rest of the sentience.
I am not going to go through all of the definitions because it's ridiculous. I can find different meanings for nearly every word in the constitution and bill of rights.
A militia is a military force that is raised from the civil population to supplement a regular army in an emergency. Having arms meaning anatomical appendages between your solders and elbows can't really supplement an army. So in this regard they are talking about armaments, meaning military weapons and equipment.
The right of the people to bear arms must not be infringed. That means that the legal entitlement of the people to hold/carry military weapons and equipment must not be altered to diminish by government or any entity or person.
That particular language isn't at all in dispute. It's quite clear through context that when they use the word arm they are talking about military weapons and equipment. You pointing out that the word "arm" disambiguated has more than one meaning doesn't really render the amendment meaningless. Nice try, but nearly every weird has two or more meanings. Here is a list of the words in the second amendment that have more than one meaning.
Well, regulated, being, free, state, Right, people, keep, bear, arms, must, be. If you really want to play this game all of our rights come into question. Speech, press, search, seizure, cruel and unusual, so on. Do you rally want to undermine the entire constitution and bill of rights to destroy one right?