This is the 711th most frequent Czech word.
zbraň
Weapon.
Here, the word 'zbraň' refers to a physical weapon that could cause harm.
Měl u sebe zakázanou zbraň.
He had an illegal weapon with him.
In this context, 'zbraň' is used metaphorically to describe something used figuratively as a way to defend oneself or achieve goals.
Jeho slova byla jeho nejsilnější zbraň.
His words were his strongest weapon.
This usage implies a general rule or instruction about handling weapons responsibly.