clam up :

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    ELMONT, N.Y. -- Rosie Napravnik , the jockey, can talk about her mount, the filly Unlimited Budget, all day and all night. If you want her to clam up, start chatting her up about being the first female rider in the 145-year history of the Belmont Stakes to ride a female horse.
    June 6, 2013 - Connecticut Post

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