Verb
plow on (third-person singular simple present plows on, present participle plowing on, simple past and past participle plowed on)
(idiomatic) To continue with a menial, tedious, or time-consuming task.
If you want to get good grades in the exam, you have to plow on with the book.
It's life isn't it? You plow ahead and make a hit. And you plow on and someone passes you. Then someone passes them. Time levels. Katharine Hepburn