sink

[1]	founder , submerge , go down , go under , plunge , descend , be engulfed
[2]	subside , cave in , collapse , subside , settle , drop , fall in , go down , slip away
[3]	descend , go down , drop , fall , move down/downward(s) , go down to/on
[4]	decline , weaken , worsen , degenerate , subside , deteriorate , flag , fail , diminish , die , expire , languish , (Colloq) go downhill
[5]	disappear , drop , drop down , vanish , fade away , evaporate , set , go down , descend , drop
[6]	settle , precipitate , descend , drop
[7]	bore , pass , lapse , put down , drill , dig , excavate , drive
[8]	submerge , settle , go down , immerse , plunge , go under
[9]	subside , stoop , bend , get , go , lower/humble oneself
[10]	invest , dip , venture , risk , put
[11]	sink in , slump , fall off , be understood , penetrate , register , make an impression on , get through to
[12]	slump , slide down
[13]	bury

[1]	sinkhole , swallow hole
[2]	cesspool , cesspit , sump
[3]	basin , wash-basin , wash-bowl , lavabo , Church font , stoup , piscina
[4]	cesspool , cesspit , pit , hell-hole , den of iniquity , sink-hole , (Colloq) dive