To be wanting; to fall short; to be or become deficient in any measure or degree up to total absence; to cease to be furnished in the usual or expected manner, or to be altogether cut off from supply; to be lacking; as, streams fail; crops fail.

To be affected with want; to come short; to lack; to be deficient or unprovided; -- used with of.

To fall away; to become diminished; to decline; to decay; to sink.

Miscarriage; failure; deficiency; fault; -- mostly superseded by failure or failing, except in the phrase without fail.

fall short in what is expected; "She failed in her obligations as a good daughter-in-law"; "We must not fail his obligation to the victims of the Holocaust"

get worse; "Her health is declining"

a tree or branch breaks or falls.