fail

1 fail /ˈfeɪl/ verb
fails; failed; failing
1 fail
/ˈfeɪl/
verb
fails; failed; failing
Britannica Dictionary definition of FAIL
1 
a  : to not succeed : to end without success
[no object]
[+ object]
— followed by to + verb
b  [no object] : to not succeed as a business : to become bankrupt
2 
a  [+ object] : to not do (something that you should do or are expected to do) — followed by to + verb
b  : to not do something
[+ object]
— followed by to + verb
[no object]
3 
[+ object] : to not do or provide something that is needed by (someone)
4 
a  : to be unsuccessful in passing (an examination, a course of study, etc.)
[+ object]
[no object]
b  [+ object] : to decide that (someone) has not passed an examination or course of study
5 
[no object]
a  : to stop working
b  : to lose strength : to become weak or weaker
2 fail /ˈfeɪl/ noun
2 fail
/ˈfeɪl/
noun
Britannica Dictionary definition of FAIL

without fail

1 
— used to stress that something always happens
2 
— used to stress that something will definitely happen