I slashed the horse with the whip, and gave him a loose rein until Woking and Send lay between us and that quivering tumult.
I felt a tug at the reins.
I went in again, according to my promise, to get my servant’s box, lugged it out, clapped it beside her on the tail of the dog cart, and then caught the reins and jumped up into the driver’s seat beside my wife.
"Give me the reins," she said, and laid the whip along the pony’s side.
My brother, with the cabman’s whip marks red across his face and hands, scrambled into the chaise and took the reins from her.
There are no more uses of "rein" in the book.
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The court reined in agency power—describing it as out of control.