chain

a  : a series of usually metal links or rings that are connected to each other in a line and used for supporting heavy things, for holding things together, for decoration, etc. — see pictures on this page, and at bicycle; see also choke chain, key chain

b  [count] : a chain that is attached to the arms or legs of a prisoner — usually plural — often used figuratively — see also ball and chain

[count] : a series or group of things or people that are connected to each other in some way — see also daisy chain, food chain

[count] : a group of businesses (such as stores, restaurants, or hotels) that have the same name and basic appearance and sell the same products or services

also : the company that owns such a group of businesses — see also chain store

[count] British : a number of people who each want to buy a house but must first sell their current house before moving to the next one — usually singular

: to fasten, hold, or connect (someone or something) with a chain — often used as (be) chained — often used figuratively