Déraille literally means "goes off the rails" (like a train) or "derails". It's an evocative verb that suggests losing control or going crazy.
In the song, Claudio Capéo uses it to question his own sanity and perspective, singing, "C'est peut être moi qui déraille" (Maybe it's me who's going off the rails). This word perfectly captures the feeling of doubt and rebellion against societal norms, making it both interesting and memorable.
Claudio Capéo questions the people who act like they have everything figured out, and decides to trust his own path instead.
He opens by admitting he might be the naive one, maybe even a little crazy, an ultra-sensitive dreamer who's been told so often it's started to feel true. But when it comes to living his own life, he'd rather act than be acted upon, and he's tired of ten unqualified people in suits dictating the story.
The chorus is where he draws the line: these are his own rules, set step by step, built on his own ideas and his own truth. "Laissez-moi" ("let me be") repeats like a refusal to keep explaining himself to anyone.
By the final verses he's blunt about it: no one else can live a man's life for him, so he ignores the instructions from start to finish, all the way down the line. It's a song about choosing self-trust over other people's certainty.