To undergo an extended period of withdrawal from alcohol or drug use especially at a special clinic
1. Rendre sec. Sécher ses cheveux.
2. (Familier) Manquer. Sécher un cours.
3. (Intrans.) Tarir. Source qui sèche.
4. (Intrans.) Flétrir. Fleur qui sèche.
When something dries out or something dries it out, all the water or other liquid in it goes away.