step in

“Well, I’ve a conscience, sir, and when I chanced to see you go into this house, as I came hobbling after you, I thought to myself, I’ll just step in and see that kind gentleman, and tell him that if I was a bit gruff in my manner there was not any harm meant, and that I am much obliged to him for picking up my books.”

Finally, when he read in the reports of the failure of this agent, he would step in himself with a master touch.

It was instantly opened by a bright-looking, clean-shaven young fellow, who asked him to step in.

“Perhaps you would care to step in, sir, and see his brother, Colonel Valentine?”