stick it out

(verb) to keep going, to endure something difficult

Example Sentences:

I know this exam is hard, but I have to stick it out. If I don’t get a good mark I’ll never get to go to law school!

Even though Rebecca’s course was difficult, she stuck it out. We’re so proud of her!

A: Are you still training for that marathon?
B: I sure am.
A: Is it going okay?
B: It’s so difficult!
A: What are you going to do?
B: I’m planning on sticking it out. I will feel so proud when I’m finished