stick it out

stick it out (stay until the end; see something through; to persist or continu) — продержаться, выдерживать, выстоять

Example 1: We're going through a tough time in our marriage, but we're going to try to stick it out because we don't want to divorce. (EB))

Example 2: Plenty of people begin the training, but few stick it out for the year or two necessary to become proficient

Related vocabulary:
[bite the bullet]
[терпи, казак, атаман будешь!]