What is another word for clammed up?
Pronunciation: [klˈamd ˈʌp] (IPA) 
Clammed up is a colloquial expression that refers to the act of becoming silent or tight-lipped, especially in situations that require communication or revelation. This phrase is often used to describe a person's reluctance to speak, due to fear, anxiety, or a desire for privacy. There are many synonyms for the phrase "clammed up," which include terms such as muted, speechless, hushed, sealed lips, buttoned up, uncommunicative, and tongue-tied. Each of these words describes a person's unwillingness to share their thoughts or feelings, whether intentionally or because of shyness or nervousness. While these terms all convey a similar idea, they differ in nuance, tone, and implications, providing a range of options for writers and speakers to choose from.
