- The definition of a watch chain is the metal chain that connects a pocket watch to a fastener that attaches to clothing.
An example of a watch chain is the gold chain that came out of a man’s vest pocket when he checked his pocket watch.
A watch suspended from a watch chain.
watch chain definition by Webster's New World
a chain attached at one end to a pocket watch, with an ornament (or fob) or a fastener at the other end