step in
verb- To act as a replacement or substitute.
- To get involved; to act.
From the library
Finally, when he read in the reports of the failure of this agent, he would step in himself with a master touch.
“Perhaps you would care to step in, sir, and see his brother, Colonel Valentine?”
It was instantly opened by a bright-looking, clean-shaven young fellow, who asked him to step in.
We heard his quick, heavy step in the passage.
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