English definition of “chain”
METAL RINGS [C, U] › a line of metal rings connected together: a bicycle chain She wore a gold chain around her neck. The hostages were kept in chains.
BUSINESS [C] › a number of similar shops, restaurants, etc owned by the same company: a chain of hotels/supermarkets
EVENTS [C] › a series of things that happen one after the other: His arrival set off a surprising chain of events.