fail

[1]	not succeed , neglect , be unsuccessful , miss , miscarry , misfire , fall short (of) , fall flat , fall through , falter , be (found) lacking/wanting , be defective , be deficient , be/prove inadequate , come to grief/naught/nothing , go wrong , abort , meet with disaster , founder , run aground , (Colloq) flop , fizzle (out) , go up in smoke , flunk
[2]	let down , go wrong , miscarry , disappoint , forsake , desert , abandon , neglect , ignore , slight
[3]	decline , betray , peter out , dwindle , diminish , wane , deteriorate , weaken , decay , fade/die (out/away) , disappear , flag , ebb , sink , languish , give out , gutter , go out
[4]	go bankrupt , go bad , give way , go out of business , go under , die , give out , go into receivership , become insolvent , conk out , go , close up shop , close up/down , break , break down , cease operation(s) , (Brit) go to the wall , (US) file for Chapter Eleven , (Colloq) fold (up) , go bust/broke , (US) drown in red ink
[5]	flunk , bomb , flush it
[6]	run out , give out