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draw in the reins
1. Literally, to pull in the reins of a bridled animal, especially a horse, to slow it down or bring it to a stop. Mary drew in the reins as she approached town, bringing her horse to a saunter.
2. By extension, to slow something down or bring it to a stop. During the economic boom, our company was making as many risky investments as we could find. Luckily, our CEO had the sense to draw in the reins on such recklessness before the economy crashed.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To stop a horse, for example, by pulling on the reins.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.