Armures literally translates to "armors". It's a powerful, visual word that you don't typically hear in a pop song, making it especially memorable.
In this poignant ballad, Louane uses it metaphorically to talk about emotional defenses. She sings, "Les fous c'est fait pour faire fondre les armures" (Crazy people are made to melt armors), suggesting that raw emotion and vulnerability have the power to break down the walls people build around their hearts.
Have you ever looked out of a car window on a long drive and suddenly felt flooded by thoughts of someone who is gone? French singer Louane nails that exact moment in "Si t'étais là" (If You Were Here). She sings that the worst moments hit during travel: "Parfois je pense à toi dans les voitures / Le pire, c'est les voyages" ("Sometimes I think of you in cars / The worst is traveling"). A random track comes on the radio ("Une chanson fait revivre un souvenir" - "A song brings back a memory"), and suddenly you are spiral-asking questions to the ceiling. To fall asleep, she admits to having imaginary chats with people who are no longer on this earth ("Avec des gens qui ne sont pas sur la terre"), wondering what advice they would give if they were still around.
What makes this track so comforting is how blunt she is about coping mechanisms that look slightly unhinged from the outside. She sings, "Je m'en fous si on a peur que je tienne pas le coup" ("I don't care if people worry I won't hold up"). Notice that casual spoken French shortcut: dropping the ne in "que je tienne pas le coup"—an idiom meaning "to keep it together" or survive a hard time. She thinks she spots signs in everyday life, and even if other people might call that crazy, she shrugs it off. After all, "Les fous c'est fait pour faire fondre les armures / Pour faire pleurer les gens dans les voitures" ("Crazy people are made to melt armor / To make people cry in cars"). It is an honest, sweet look at missing someone so deeply that you keep talking to them anyway.