dial (one) back

To call one back. I'm sorry, my phone is about to die. Let me go grab my charger, and I'll dial you back in a few minutes, OK? Stu just walked in. Let me see where he stands on this, and I'll dial you back. A: "What happened? You were supposed to dial me back hours ago!" B: "I'm sorry, we had a real crisis to deal with all of a sudden."

dial back

To lessen something, especially in intensity or frequency. I could barely move my arms all week—I guess it's time to dial back the workouts! Their campaign has been airing tons of attack ads against their opponent, but they seem to be dialing those back lately. Whoa, Anthony, dial back the shouting—there's no need for that here.