sétendait
sétendait is a French verb in the imperfect tense, third-person singular form of the verb s'étendre. The verb s'étendre means to extend, to spread out, to stretch, or to lie down. Therefore, sétendait translates to "was extending," "was spreading out," "was stretching," or "was lying down."
In French grammar, the imperfect tense is used to describe ongoing actions in the past, habitual actions
Another usage could be to describe a physical position. For instance, "Le chat sétendait au soleil" translates