Definition of watch fob in English:

watch fob

Pronunciation /ˈwɒtʃ ˌfɒb/

noun

US
  • A chain or strap attached to a watch for carrying in a waistcoat or waistband pocket, often worn hanging outside the pocket; (later also) a small decorative fob or functional object attached to such a chain or strap. Compare "fob", "watch-charm".

Origin

Late 18th century (in an earlier sense). From watch + fob.