To be utterly stunned or dumbfounded, often from extreme surprise or fright, characterized by a blank stare and an open mouth.
当她听到那个突如其来的好消息时，整个人目怔口呆，好一会儿才回过神来
When she heard the sudden good news, she was completely stunned and speechless, taking a while to come back to her senses.
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