Être lessivé.

The French expression "être lessivé" literally translates to "to be laundered" or "to be washed out." Its figurative meaning, "to be extremely tired," draws a vivid comparison to the state of clothes after a thorough washing. To understand the origin of this idiom, we first need to look at the verb "lessiver." It comes from the Old French "lessiver," which itself is derived from "lessive," meaning "laundry" or "lye." Lye, a strong alkaline solution, was historically a key component in the washing process, used for its powerful cleaning properties. The word "lessive" ultimately traces back to the Latin "lixivium," referring to the liquid obtained from leaching ashes, which was also used for cleaning. The act of "lessiver" implies a rigorous and often exhaustive process of cleaning, where dirt and grime are thoroughly removed. When applied to a person, the imagery is powerful: just as clothes emerge from the wash stripped of their impurities and often limp and depleted, a person who is "lessivé" is portrayed as having had all their energy and vitality drained away. They are figuratively "washed out" or "wrung out" by fatigue, stress, or strenuous activity. This expression likely emerged from common everyday experiences with laundry. The physical effort involved in traditional washing methods – scrubbing, wringing, and drying – could be quite tiring. Therefore, to feel "lessivé" was to feel as exhausted as one would after a long and arduous laundry day. The idiom effectively uses a concrete, relatable image (the state of laundered clothes) to convey an abstract feeling (extreme fatigue). It's a testament to the richness of the French language in creating such evocative and descriptive phrases. Over time, "être lessivé" became a widely understood and used expression to describe profound physical or mental exhaustion, encapsulating a sense of being completely spent, with no energy left to give. It's a more emphatic way of saying "être fatigué" (to be tired) or "être épuisé" (to be exhausted), emphasizing the complete depletion of one's resources.