the most difficult task. (Informal. The first entry is usually with a.)
We had a devil of a job fixing the car.It was the devil's own job finding a hotel with vacancies.
a devil of a job
A difficult or frustrating time; much difficulty. I'm having a devil of a job getting this window open—I think it has been painted shut.We had a devil of a job convincing Grandpa to go to the doctor for that bad cough.
devil of a job
and devil's own job
the most difficult task. We had a devil of a job fixing the car.It was the devil's own job finding a hotel with vacancies.
a/the ˈdevil of a job, nuisance, fellow, etc.
(old-fashioned) a difficult or an unpleasant example of something: We’re going to have a devil of a job getting the roots of that tree out of the ground.