don't make threats you cannot carry out

don't make threats you cannot carry out

Don't threaten to do something or punish someone unless you are both willing and able to do it. A: "If they keep grumbling like that, I'll just tell them that they're pay will start getting docked." B: "Careful, Jim. You know that half the staff would walk out if you did that, and they know that too. Don't make threats you can't carry out."
See also: cannot, carry, make, out, threat