This is the 536th most frequent Portuguese word.
arma
"Arma" in Portuguese means "weapon" in English.
Here, 'arma' is used in its literal sense to refer to a weapon.
A polícia confiscou a arma do suspeito.
The police confiscated the suspect's weapon.
In this sentence, 'arma' is used metaphorically to represent a tool or means of achieving something beneficial.
O conhecimento é a arma mais poderosa contra a ignorância.
Knowledge is the most powerful weapon against ignorance.
Here, 'arma' is metaphorically describing a skill as a strategic advantage or means for success.