To look anxious or flustered, with a noticeable change in facial color (e.g., pale or flushed), due to impatience, worry, or being in a hurry.
听到孩子迟迟未归，她急扯白脸地在门口来回踱步。
Hearing that her child hadn't returned home yet, she paced back and forth at the door, her face pale with anxiety.
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