To shout abuse; to let loose a torrent of abuse.
用恶语骂人。
清·李宝嘉《官场现形记》茶房未及开口，那女人已经破口大骂起来。”
He was so angry that he started cursing loudly, breaking into a stream of insults.
Learn the next connected idiom: 破口大骂 (pò kǒu dà mà) → 骂不绝口 (mà bù jué kǒu)
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