clam up
US /klæm ʌp/
UK /klæm ʌp/
1.
im bặt, ngậm miệng
to suddenly stop talking, especially when you are expected to speak
:
•
When the police started asking questions, he just clammed up.
Khi cảnh sát bắt đầu hỏi, anh ta chỉ im bặt.
•
She tends to clam up when she's nervous.
Cô ấy có xu hướng im bặt khi lo lắng.