Collins COBUILD Advanced Learner's English Dictionary - keep to

1. If you keep to a rule, plan, or agreement, you do exactly what you are expected or supposed to do. You’ve got to keep to the speed limit... = stick to PHRASAL VERB: V P n 2. If you keep to something such as a path or river, you do not move away from it as you go somewhere. Please keep to the paths. = stick to PHRASAL VERB: V P n 3. If you keep to a particular subject, you talk only about that subject, and do not talk about anything else. Let’s keep to the subject, or you’ll get me too confused. = stick to PHRASAL VERB: V P n 4. If you keep something to a particular number or quantity, you limit it to that number or quantity. Keep costs to a minimum. PHRASAL VERB: V n P n