察言观色（chá yán guān sè）

察言观色（chá yán guān sè）examine a man's language and observe his countenance
观察别人的说话或脸色。多指揣摩别人的心意
carefull to weigh up a person's words and closely watch his expression
他善于察言观色，一眼就看出这个人有心事。
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