godan verb (-su)
stamp out (a fire)
Specifically refers to extinguishing a fire by stepping on it. Often used for small fires like a cigarette butt or a campfire.
タバコの火を踏み消した。
I stamped out the cigarette.
落ち葉の小さな火を急いで踏み消した。
I quickly stamped out the small fire in the fallen leaves.