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Synonyms for Sink (same or very similar meaning)

WordNet sense 1 (a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof):
sinkhole, swallow hole

WordNet sense 2 (a covered cistern; waste water and sewage flow into it):
cesspool, sump, cesspit

WordNet sense 3 (appear to move downward):
dip

WordNet sense 4 (go under):
settle, go down, go under

WordNet sense 5 (fall or sink heavily):
slump, slide down

WordNet sense 6 (fall or drop to a lower place or level):
drop, drop down

WordNet sense 7 (pass into a specified state or condition):
lapse, pass

WordNet sense 8 (descend into or as if into some soft substance or place):
subside

WordNet sense 9 (embed deeply):
bury

WordNet sense 10 (fall heavily or suddenly; decline markedly):
fall off


From the ODE community, based on WordNetadd/edit