subsidence

英 [səb'saɪd(ə)ns; 'sʌbsɪd(ə)ns] 美[səb'saɪdns]

• n. 下沉；沉淀；陷没

1. an abatement in intensity or degree (as in the manifestations of a disease);

"his cancer is in remission"

2. a gradual sinking to a lower level

3. the sudden collapse of something into a hollow beneath it