keeping a tight hold on something


Senior Member

what does"keeping a tight hold" means in the following sentence? does it mean "keeping promises" or "doing what she said or claimed"?

“I have spent so much of my life in the public eye, keeping a tight hold on what I say and how I react to things, that it is such a relief to have friends with whom I can be vulnerable and unedited.”

Source: Hillary Rodham Clinton. “What Happened.”
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