step forward
—phrasal verbwithstepverb[I+ adv/prep]uk/step/us/step/-pp-
tooffertoprovideor do something, or tohelpwith something
站出来；自告奋勇；挺身而出
No one hasyetsteppedforwardtoclaimresponsibilityfor theattack.仍未有人站出来宣称对这次袭击事件负责。
At the lastminuteanothercompanysteppedforwardwithabid.最后关头，另一家公司站出来投标。