stick it out
Upper Intermediate (B2)informal
Stay with something hard and don't quit, even when you really want to.
"The first year of the degree was tough, but she decided to stick it out."
Hear it in context

If It’s Not Right, Leave | Aviva CEO Amanda Blanc
CNBC International · 18:35
Nobody ever said, like, you know, stick it out, stick it out.

Sunrise on the Reaping A Hunger Games Novel By Suzanne Collins AudioBook P1
AudioBookEng · 593:58
Maybe we two should stick it out together.

15 ENGLISH PHRASAL VERBS: stick up, stick out, stick to, stick with...
Adam’s English Lessons · engVid · 2:53
it could also be, "to stick it out".

15 ENGLISH PHRASAL VERBS: stick up, stick out, stick to, stick with...
Adam’s English Lessons · engVid · 2:56
Now, if you say, you know, "stick it out",

The Blueprint: How Kountry Wayne Became a Digital Mogul | SWAY’S UNIVERSE
SWAY'S UNIVERSE · 24:38
I'm just going to stick stick it out.