1. vi.下降至较低或正常水平　sink to a lower or to the normal level
2. vi.（土地）下陷；（建筑物等）下陷　(of land) sink, e. g. because of mining operations underneath; (of buildings, etc.) sink lower into the ground
3. vi.减弱，减轻，平静下来，平息　become less violent, active, intense, etc.

　The flooded river was subsiding rapidly.　泛滥的河水正在迅速退落。
　The hills subsided toward the shore.　小山向海岸下斜。
　His anger quickly subsided.　他的怒气很快就消了。