撂下脸来 be suddenly serious
撂下
Drop it
以上为机器翻译结果，长、整句建议使用 人工翻译 。
我发送任何一个回复，我所能做的就是满足我的自我，挥出了一记拳，撂下了一句狠话。
If I sent a reply of any sort, all I would be doing is satisfying my own ego and getting in a jab or a last word.
youdao
听说有急诊，医生撂下筷子就走。
Hearing that there was an emergency case, the doctor put down his chopsticks and left at once.
《新英汉大辞典》
“寄账单来。” 他撂下句话。
"Send the bill, " he said.
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