Meaning of “keep a tight rein on sb/sth” in the English Dictionary

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"keep a tight rein on sb/sth" in British English

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keep a tight rein on sb/sth

also keep sb/sth on a tight rein

to have a lot of control over someone or something:

My father always kept us on a tight rein.

(Definition of “keep a tight rein on sb/sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)