Definition of "Fail" :

verb: get worse

verb: stop operating or functioning

"The engine failed on the way to town."

verb: prove insufficient

"The water supply for the town failed after a long drought."

verb: disappoint, prove undependable to; abandon, forsake

"His sense of smell failed him this time."

verb: become bankrupt or insolvent; fail financially and close

"A number of banks failed that year."

verb: fall short in what is expected

"She failed in her obligations as a good daughter-in-law."

verb: fail to get a passing grade

"She studied hard but failed nevertheless."

verb: judge unacceptable

"The teacher failed six students."

verb: be unsuccessful

"Where do today's public schools fail?."

verb: fail to do something; leave something undone

"She failed to notice that her child was no longer in his crib."

verb: be unable

"I fail to understand your motives."