This is the 17548th most frequent Polish word.
zbroi
"Zbroi" means "armors" or "arms" (as in suits of armor) in English.
Here 'zbroję' refers to physical armor worn for protection, demonstrating the noun form in singular accusative case.
Rycerz nosi zbroję na polu bitwy.
The knight wears armor on the battlefield.
In this context, 'zbroi' is used as a verb (third person singular present tense of 'zbroić się') meaning 'to arm oneself', illustrating the reflexive verb use.
On zbroi się przeciw wrogom.
He arms himself against enemies.
Here 'zbroi' is used as a verb (third person singular present tense of 'zbroić') meaning 'to reinforce or strengthen', showing a different verb application.