stick by

1. 1.

   continue to support or be loyal to (someone), typically during difficult times.

   "I love him and whatever happens, I'll stick by him"

   synonyms:

   be loyal to, be faithful to, be true to, stand by, keep faith with, keep one's promise to "Rodney stuck by me when everyone else bailed out"

2. 2.

   another way of saying stick to below.

I ran on a set of principles, and it doesn’t really matter which party is in charge or who the president is; I’m going to stick by my principles.