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English definition of “rein sth in”

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 reinsHorse ridingHorse racing

(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.Controlling and being in charge
(Definition of rein sth in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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