towel: [13] A towel is etymologically something for ‘washing’ with. The word comes from Old French toaille, which was a borrowing from prehistoric Germanic *thwakhliō. This was derived from the verb *thwakhan ‘wash’, whose modern descendants include Swedish tvätta and Danish tvætte ‘wash’. Another relative is Swedish tvål ‘soap’. [towel etymology, towel origin, 英语词源]