踏み切る

Etymology
From (fumu, "step on," "tread on," "stamp") +  (kiru, "perform an action boldly").

Verb

 * 1) make a bold start, take a plunge
 * 2) take off
 * 3)  step out of the ring

Derived terms

 * , (fumikiri): railway crossing, starting line
 * (fumikiriban): gatekeeper, crossing guard