鎖 - chain, irons, connection

blockade; lockdown; sealing off (an area)

closing; closure

chain; chains

national isolation; closing the country (to foreigners)

chain; series; connection

economic blockade; embargo

chain bridge

rain chain (hanging from a gutter and functioning as downspout, often made of ornamental cups)

aortic incompetence

side chain

obturator artery

collarbone; clavicle