This is the 393rd most frequent Polish word.
broni
"Broni" means "defends" or "protects" in English.
The word 'broni' here is a verb meaning 'defends' from the verb 'bronić', used in the context of standing up for someone.
Ona zawsze broni swoich przyjaciół, gdy ktoś ich krytykuje.
She always defends her friends when someone criticizes them.
In this sentence, 'broni' is a noun meaning 'weapons', functioning as a plural form in the context of a collection of items.
W muzeum pokazali kolekcję starej broni z różnych epok.
In the museum, they showcased a collection of old weapons from various eras.
Here, 'broni' is also a noun meaning 'arms' or more specifically 'firearms', referring to weapons in general.