Jeff in Green Bay, Wisconsin, is looking for a specific word for “exhaustion after extreme physical activity, such as running a marathon.” Synonyms for exhausted include knackered and forswunk, from swink, meaning “to toil” or “to work hard.” In extreme sports, people use the term bonking to mean “being depleted,” or metaphorically hitting the wall. There’s also dog-tired, plum tired, running on fumes, and out of gas. In French, the expression coup de pompe is aviators’ slang for “the sudden drop passengers feel during turbulence” and can refer to such sudden depletion. This is part of a complete episode…