was drying, was drying out, was skipping (class)
Leon séchait les cours.
Leon was skipping class.
Et si on séchait les cours et qu'on allait à la plage ?
What if we skipped class and went to the beach?
Tom séchait l'école.
Tom was skipping school.
Tom séchait souvent les cours quand il était enfant.
Tom often skipped school when he was a child.