keep a tight grip on (someone or something)

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keep a tight grip on (someone or something)

To maintain strict or tight control over someone or something; to not allow someone or something very much independence or autonomy. Ever since George lost most of their life savings in a drunken poker match, Dana has started keeping a tight grip on the family finances. The boss has kept a tight grip on her assistant ever since she first hired him.
See also: grip, keep, on, tight
References in periodicals archive ?
The SEC keeps a tight grip on how mutual funds and money managers can advertise their track records, but the Supreme Court has ruled that newsletters have much greater leeway.