to prevent something or someone unpleasant from coming too near you or harming you
Hey, Matt get me some vitamins, because I need to keep this swine flue at bay!
Keep at bay!

Back in Europe of the 1700s, another drink was developed that mixed warm milk and eggs with sherry or brandy to keep the chill at bay.
by EnglishRepublic November 18, 2009
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to control something and prevent it from causing you problems
She fought to keep troubles at bay.
by Daghfag November 06, 2010
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Managing your man or woman from causing you trouble by keeping him in line.
Jon hasn't checked out liz's booty in the last 3 days. Clearly, I am keeping bae at bay.
by Fall Bondler June 07, 2017
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