A person who brings trouble or disgrace to the group, acting as a bad influence on others.
桅马群的劣马。比喻桅社会或集体的人。
《庄子·徐无鬼》夫为天下者，亦奚以异乎牧马者哉？亦去其害马者而已矣。”
He is the one who always complains and spreads negativity at work, a real troublemaker.
Learn the next connected idiom: 害群之马 (hài qún zhī mǎ) → 马不停蹄 (mǎ bù tíng tí)
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