Accrocher literally means "to hang" or "to hook". It's a very physical verb that creates a powerful image.
In the song, the artist uses it metaphorically to describe holding onto a dream, singing, "De m'y accrocher de toutes mes forces" (To hang on to it with all my strength). This expresses an intense determination and refusal to let go, making it a very motivational and memorable word.
This song is a powerful declaration about what music means to the artist. For Coco, music isn't just a hobby; it's her entire identity. She says, "La musique c'est plus qu'une part de moi / C'est ce que je suis" (Music is more than a part of me / It's what I am). When life gets tough, she doesn't overthink it, she picks up her guitar. She follows her heart instead of her head, and she believes in the incredible power of music to connect with us, asking, "Avez-vous dejá eu ce sentiment étrange qu'une chanson était faite / Spécialement pour vous?" (Have you ever had that strange feeling that a song was made / Specially for you?).
The song takes a very dreamy turn towards the end. After talking about how she had to build her own future and chase her own dreams, the lyrics become a spoken-word scene. She seems to wake up from a dream, calling for her dog, Dante. She sounds confused, asking "Qu'est-ce qui se passe?" (What's happening?). It ends with the realization that she's not dreaming after all: "Alors c'est pas un rêve / Vous êtes vraiment tous là" (So it's not a dream / You are all really here). It feels like the moment her musical dream finally became her reality.