横行霸道 act wantonly and tyrannically
Explanation
指仗势欺人，蛮横不讲理，为所欲为。形容人行为霸道，不顾及他人感受。
It means relying on power to bully others, being unreasonable, and acting arbitrarily. It describes people who behave recklessly and disregard the feelings of others.
Origin Story
话说清朝贾府，薛蟠仗着家世显赫，在府中横行霸道，欺压仆人，甚至对贾母也不敬重。他整日游手好闲，与狐朋狗友厮混，惹是生非，闹得府中鸡犬不宁。贾府上下，人人对其避之不及，却又无可奈何。一日，薛蟠因酒后滋事，误伤了人，贾府上下这才开始警觉起来，意识到薛蟠的胡作非为已经到了无法容忍的地步。最终，贾府家主不得不采取措施，严厉斥责了薛蟠，并限制了他的行动。虽然薛蟠表面上服从了，但其内心的嚣张跋扈并未改变。这个故事告诉我们，依仗权势横行霸道，最终只会自食恶果。
In the Qing Dynasty, Xue Pan, relying on his prominent family background, acted wantonly and tyrannically in the Jia Mansion, bullying servants and even showing disrespect to Mrs. Jia. He spent his days idling, associating with dissolute companions, and causing trouble, creating chaos in the mansion. Everyone in the Jia family tried to avoid him, yet they were helpless. One day, Xue Pan injured someone after drinking, which finally made the Jia family realize that Xue Pan's unruly behavior was intolerable. Finally, the head of the Jia family had to take measures, severely reprimanding Xue Pan and restricting his actions. Although Xue Pan outwardly obeyed, his inner arrogance and domineering nature remained unchanged. This story teaches us that those who rely on power to act wantonly and tyrannically will eventually reap what they sow.
Usage
用作谓语、定语、状语；形容人或势力蛮横霸道，不讲道理。
Used as predicate, attributive, adverbial; describes a person or force as arbitrary, tyrannical and unreasonable.
Examples
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他仗势欺人，横行霸道，最终受到了法律的制裁。
tā zhàngshìqīrén, héngxíngbàdào, zuìzhōng shòudào le fǎlǜ de zhìcái.
He bullied others and acted arbitrarily. Finally, he was punished by law.
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薛蟠在贾府横行霸道，无人敢管。
xuē pán zài jiǎfǔ héngxíngbàdào, wúrén gǎn guǎn
Xue Pan was arbitrary in the Jia mansion, and no one dared to control him