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English definition of “rein sth in”

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rein sth in

verb uk phrasal verb with rein   /reɪn/ us  

(HORSE)

to make a horse go more slowly or stop by pulling on its reins

(ACTIVITY)

( also rein sth back) to control an emotion, activity, or situation to prevent it from becoming too powerful: We tried to rein in our excitement and curiosity. Reports today suggest consumers are already reining back spending.
(Definition of rein sth in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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