The difference between Put the brakes on and Rein in
When used as verbs, put the brakes on means to stop (an event, action, or process) or to slow it down, whereas rein in means to stop or slow a horse by pulling the reins.
check bellow for the other definitions of Put the brakes on and Rein in
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Put the brakes on as a verb (idiomatic, transitive):
To stop (an event, action, or process) or to slow it down.
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Put the brakes on as a verb (idiomatic, intransitive):
To cease to perform one's current activity or to decrease one's level of activity.
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Rein in as a verb:
To stop or slow a horse by pulling the reins
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Rein in as a verb (idiomatic):
To stop or slow something, by exercising control.
Examples:
"The government has no other option than to rein in public spending."