Munição means "ammunition," the bullets or shells fired from a weapon. It is a striking choice here, since the whole song builds a metaphor comparing love and heartbreak to warfare, turning ordinary words into weapons.
The line "Deixam sobrar munição" ("they leave ammunition left over") plays on the idea of lovers as poets firing words at each other, with whatever goes unsaid still loaded, ready to wound later.
Have you ever wondered what it's like to be far away from the person you love most? Bárbara Tinoco's "Carta de Guerra," which means "War Letter," paints a vivid picture of this feeling. The song is written from the perspective of a soldier who has received a photo from his beloved. He tells her she's just as beautiful as when he left and promises they'll get married as soon as he returns, saying he'll go "straight to the altar."
Despite trying to sound brave and saying life is "good like it says in the newspaper," he can't hide his true feelings. He deeply misses the simple, normal days before the war, back when his uniform was just a way to impress her. The chorus reveals his deepest desire: "I just want to go home to you." It's a powerful and emotional message about love and longing during a difficult separation, where the only thing that truly matters is being reunited with the one you love.