/ səbˈsaɪdns; NAmE ; ˈsʌbsɪdns/ noun
[ U ] the process by which an area of land sinks to a lower level than normal, or by which a building sinks into the ground
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WORD ORIGIN
mid 17th cent.: from Latin subsidentia sediment, from the verb subsidere , from sub- below + sidere settle (related to sedere sit).