mess up meaning: 1. mess up sth • mess sth up informal to spoil something important, especially something that it has taken you a long time to plan or do: ▪ If you make a mistake like that it c...mess up en francais:abîmer, détériorer; mettre en désordre, salir; rater; frapper durementmess up artinya:mengacaukanmess up 뜻:엉망이되게하다mess up перевод:1) пачкать Ex: you mess up your shirt вы испачкали рубашку