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Discover LudwigThe phrase "clammed up" is correct and usable in written English
It means to become silent or refuse to speak. For example, "When I asked her why she left the company, she clammed up and didn't say a word."
Dictionary
clammed up
verb
Past of clam up
Exact(58)
Sir Richard promptly clammed up.
He then rather clammed up!
Six months ago, she clammed up altogether.
He clammed up like a noir desk clerk.
As inter-bank markets worldwide clammed up, they began to look vulnerable.
The song is doing well in the country charts.Other musicians have clammed up about politics altogether.
"Her and her lawyer have now clammed up," one of the officials said on Tuesday afternoon.
Then he clammed up, frozen and flabbergasted by his own outburst.
One informer, however, clammed up and disappeared when the investigators asked for more information.
Lewinsky would have noticed the stares and would have clammed up a little.
Her once chatty hairdresser clammed up when she noticed the surgical scars on her scalp.
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