handcuff (n.) Look up handcuff at Dictionary.com
1640s as a decorative addition to a sleeve; 1690s as a type of restraining device, from hand (n.) + cuff (n.). Old English had hondcops "a pair of hand cuffs," but the modern word is a re-invention. The verb is first attested 1720. Related: Handcuffed; handcuffing.