v fall or descend to a lower place or level
v cause to sink
v pass into a specified state or condition
v go under, "The raft sank and its occupants drowned"
v descend into or as if into some soft substance or place
v appear to move downward
v fall heavily or suddenly; decline markedly
v fall or sink heavily
v embed deeply
s having a sunken area
a. 沉没的, 下凹的
sink的过去分词