'tightener' originates from the verb 'tighten', which comes from the Old English word 'tīhtan', meaning 'to make tight'.

'tighten' evolved from the Old English 'tīhtan' and eventually became the modern English word 'tighten', from which 'tightener' is derived.

Initially, it meant 'to make something tight', and this meaning has largely remained the same in modern usage.