A acepción é esta:*
to not do something which you should do:
[+ *to* infinitive] He failed *to* arrive on time.
The club had been promised a grant from the council, but the money failed *
to* (= did not) materialize.
You couldn't fail *to* be (= It is impossible that you would not
be)affected by the film.
I'd be failing *in* my duty if I didn't tell you about the risks involved in
así que "non foi quen", "non puido", "non deu" así como "non se puido", "non
se deu" e similares, ademais das que valorares.