step in1.■走进：to step in the meeting-house步入会场2.■串门，登门造访：Here we are, this is my house. Why don't you step in?我们到了，这就是我家，进来坐一会儿吧!3.■伸脚穿进：to step in the slippers伸脚穿上拖鞋4.■插手，介入，干涉：Seeing such a situation, I had to step in.看到这种情况，我不得不出来解围了。to step in with an offer of weapons提供武器进行干预