clammed up; clamming up; clams up
Definition of clam up
: to become silent
clammed up and refused to talk
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“Clam up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/clam%20up. Accessed 2 Mar. 2021.
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Time Traveler for clam up
The first known use of clam up was in 1916
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