stick to

verb

stuck to; sticking to; sticks to

1

: to continue doing or using (something) especially when it is difficult to do so

She stuck to her story about the money already being missing when she got there.

Please stick to the script/subject/rules.

Stick to the marked trails.

If you want to succeed, you've got to stick to it and not give up.

2

: to not change (a decision, belief, etc.)

I intend to stick to my promise/word.

She's sticking to her decision to retire.