To change color and expression due to extreme shock, fear, or panic; to look pale and flustered.
听到这个突如其来的坏消息，他瞬间变色易容，手足无措。
Upon hearing the sudden bad news, he instantly changed color and expression, becoming flustered and at a loss.
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To change color and expression due to extreme shock, fear, or panic; to look pale and flustered.