stick to

verb2

1. •
   To persist; to continue (to use, do, etc.)

   • I have seen all the fancy electric toothbrushes, but I'm going to stick to the old-fashioned kind.
   • If you stick to your studies, you will continue to improve.
2. •
   To follow and remain close to.

   • The suspect doubled back through an alley, but the detective stuck to him like glue.