1 not succeed
ADV. dismally, miserably I tried to cheer her up, but failed miserably. | spectacularly The show didn't just fail, it failed spectacularly.
VERB + FAIL cannot/could not, can/could hardly The song can't fail to be a hit (= will definitely be a hit). | be bound to, be destined to, be doomed to an enterprise that was doomed to fail from the start
PREP. in Doctors are failing in their duty if they do not warn their patients of the dangers.
2 fail to do sth: not do sth
ADV. totally The authorities have totally failed to address this problem.