(third-person singular simple present clams up, present participle clamming up, simple past and past participle clammed up)
By analogy with a clam closing itself.
"clam-up." YourDictionary, n.d. Web. 08 December 2018. <https://www.yourdictionary.com/clam-up>.
clam-up. (n.d.). Retrieved December 08th, 2018, from https://www.yourdictionary.com/clam-up
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