If not a scribal or editorial error, the lexeme is a contraction of the expression ne peut chaler. For the usage of the uncontracted phrase (poer + chaler), see: 'de l’orgoil de cest mund ne lui porrad chaler' (guisch 1404) and 'Ne poet chaloir si il les aime ou hiet' (Rom 32 76), both sub chaler¹.