HOW DO I CUT MY BATHTUBS WATER OFF ASAP?

My bathrooms handle where you turn the water on and off has popped off and water is going everywhere at hard speeds and wont stop it is a 19060 style house! YOU CANNOT CUT IT OFF FROM THE SINK HOW DO I TURN IT OFF I NEED IT TURNED OFF ASAP PLEASE HELP ME
Update: 1960's style house the handle popped off water is speeding out at hard pressure and it wont stop it only stops if i push the handle in which i cant keep holding please somebody help me
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