step in
phrasal verbwithstepverb[I+ adv/prep]uk/step/us/step/-pp-
tobecomeinvolvedin adifficultsituationorargumentinordertohelpfindasolution:
插手；介入；居中斡旋[+ to infinitive]Anoutsidebuyerhassteppedintosavethecompanyfrom going out ofbusiness.一个外来买主介入，使公司免于破产。
When theleadingactressbrokeherleg, Isobelsteppedin and took over.女主角摔断了腿，伊索贝尔临时加入顶替了她。
Taking part and getting involved
- actor
- all in
- along
- attendee
- be (a) party tosomethingidiom
- catch
- concern
- go in onsomething
- hat
- have a horse in the raceidiom
- have skin in the gameidiom
- horse
- immersion
- muscle
- neck
- pitch in
- plunge
- plunge in/plunge intosomething
- punch above your weightidiom
- re-engage