grind it out
To continually work on a difficult task. I've been grinding it out, trying to figure out where this discrepancy in the budget came from.
grind out
1. To produce something by crushing or pulverizing, as through a machine. A noun or pronoun can be used between "grind" and "out." The workers in here are grinding out flour from grain.
2. To make, create, or produce something perfunctorily and unenthusiastically. A noun or pronoun can be used between "grind" and "out." How many of these stupid articles do I have to grind out before someone at the magazine takes my work seriously?
3. To work hard to do or accomplish something. A noun or pronoun can be used between "grind" and "out." With hard work and a focus on defense, we should be able to grind out a victory against this team. It took hours to grind out a compromise, but we're finally in agreement now.