This is the 12905th most frequent Polish word.
obronią
"Obronią" means "they will defend" in English.
In this sentence, 'obronią' is the third person plural future tense form of the verb 'obronić', which means 'to defend'. It refers to the act of protecting or upholding their title.
Piłkarze obronią swoje mistrzostwo.
The football players will defend their championship.
Here, 'obronią' is used figuratively to express the future act of safeguarding their freedom.
Ludzie wierzą, że obronią swoją wolność.
People believe that they will defend their freedom.
In this context, 'obronią' indicates the action of protecting the city proactively in the future.