IPA: /ˈtaɪˌpɪn/
KK: /ˈtaɪˌpɪn/
A small decorative pin used to hold a necktie in place on a shirt.
He wore a silver tiepin that matched his cufflinks.
Tiepin → The word is formed from "tie" (from Old English *tīe*, meaning to fasten or bind) and "pin" (from Old English *pinn*, meaning a small pointed piece of metal). A tiepin is a small metal piece used to fasten or bind a tie in place.
Think of 'fastening' something ('tie') with a 'small metal piece' ('pin') — that's what a tiepin does.