tire: [OE] Tire is something of a mystery word. It was relatively common in the Old English period (where it originally meant ‘fail, cease, come to an end’ – ‘become weary’ is a secondary development), but then it disappeared, to return in the 14th century. Nor is anything certain known about its pre-English ancestry, although it may go back to the Indo-European base *deus- (source also of Sanskrit dosa- ‘fault, lack’). The use of the past participle tired as an adjective dates from the late 14th century. [tire etymology, tire origin, 英语词源]