If you stick to rules, you do what they say you must do. Obviously we are disappointed but the committee could do nothing less than stick to the rules Police must stick to the highest standards if they are to win back public confidence
If you stick to something, you continue doing, using, saying, or talking about it, rather than changing to something else. Perhaps he should have stuck to writing
If you stick to a promise, agreement, decision, or principle, you do what you said you would do, or do not change your mind. Immigrant support groups are waiting to see if he sticks to his word But one problem is that few people can stick to a diet for long. to stick to your guns: see gun = stick by
If you stick to something or someone when you are travelling, you stay close to them. There are interesting hikes inland, but most ramblers stick to the clifftops