Mouth opened.
Meaning: This means that the person reading the book is so surprised or amazed that their mouth has opened in shock or wonder. It's like saying, The reader's mouth opened wide in amazement.
Choice of Words: Mouth is the opening through which food is taken in and vocal sounds emerge. Opened is the past tense of the verb open, which means to move or cause to move (something) so that it no longer prevents access, view, or passage.
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Related Expressions