English version

clam up

From Longman Dictionary of Contemporary Englishclam up phrasal verbinformalTALK TO somebody to suddenly stop talking, especially when you are nervous or shy A sensitive child is likely just to clam up. clam→ See Verb table
Examples from the Corpus
clam upHe always clams up when I ask him about his job -- do you think he's doing something illegal?The police took her in for questioning, but she clammed up when they asked about her boyfriend.
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Verb table
clam
Simple Form
Present
I, you, we, theyclam
he, she, itclams
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Past
I, you, he, she, it, we, theyclammed
Present perfect
I, you, we, theyhave clammed
he, she, ithas clammed
Past perfect
I, you, he, she, it, we, theyhad clammed
Future
I, you, he, she, it, we, theywill clam
Future perfect
I, you, he, she, it, we, theywill have clammed
> View Less
Continuous Form
Present
Iam clamming
he, she, itis clamming
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you, we, theyare clamming
Past
I, he, she, itwas clamming
you, we, theywere clamming
Present perfect
I, you, we, theyhave been clamming
he, she, ithas been clamming
Past perfect
I, you, he, she, it, we, theyhad been clamming
Future
I, you, he, she, it, we, theywill be clamming
Future perfect
I, you, he, she, it, we, theywill have been clamming
> View Less