Weapons or parts of my body?
（ I pull my coat collar to my neck, and tuck in my arms to squeeze into the crowd.）

Can you tell what ARMS exactly mean here without any further context?

Question

Weapons or parts of my body?
（ I pull my coat collar to my neck, and tuck in my arms to squeeze into the crowd.）

Can you tell what ARMS exactly mean here without any further context?

Answer

Yes, you have used arms correctly. This usage and phrasing easily references the body part.

Answer

Yes, it means the limbs of your body - shoulder to hand. The rest of the sentence (neck, pull to, squeeze into) tells us that it's the physical arms of her body.

In the full context (yes, it was very easy to find the original text), there's no indication at all that "arms" would mean weapons.