理直气壮 confident and assertive
Explanation
理直气壮形容理由充分，说话气势旺盛。理直表示理由正确充分，气壮表示气势旺盛。
Li zhi qi zhuang describes someone who is confident and assertive because their arguments and reasons are valid.
Origin Story
话说唐朝时期，有个名叫李白的诗人，他仗义执言，经常为百姓抱不平。一次，他路见不平，发现一群地痞流氓正在欺负一个老农，老农手里的农具都被抢走了。李白见此情景，心中愤愤不平，他挺身而出，大声呵斥这些地痞流氓。那些地痞流氓见李白气宇轩昂，气势逼人，一个个吓得不敢吭声。李白理直气壮地对他们说："你们这些欺软怕硬的恶霸，今天我就替天行道，替老百姓讨回公道！"说完，他便从那些地痞流氓手中夺回了老农的农具，并把他们痛斥了一番。地痞流氓们见李白如此气势汹汹，又理直气壮，最终灰溜溜地逃走了。从此以后，当地再也没有人敢欺压百姓了，这都得益于李白理直气壮的仗义执言。
During the Tang Dynasty, there was a poet named Li Bai, known for his justice and outspokenness. One day, he witnessed a group of thugs bullying an old farmer, stealing his farming tools. Filled with righteous anger, Li Bai stepped in, loudly rebuking the thugs. Their intimidating demeanor faltered before Li Bai's confident and forceful presence. He declared with unwavering conviction, "You bullies who prey on the weak, today I will uphold justice and restore fairness to this old farmer!" He reclaimed the farmer's tools and delivered a scathing rebuke to the thugs. Cowed by his righteous anger and firm stance, they fled in shame. Thanks to Li Bai's courage and righteous anger, no one dared to oppress the people in that area ever again.
Usage
形容理由充分，说话气势旺盛。
Describes a strong and confident attitude based on compelling arguments and reasons.
Examples
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他理直气壮地为自己辩解。
ta lizhiqizhuang de wei ziji bianjie.
He argued for himself confidently and reasonably.
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面对证据，他理屈词穷，再也不敢理直气壮了。
mian dui zhengju, ta liquciqiong, zai ye bugan lizhiqizhuang le
In the face of evidence, he was speechless and no longer dared to speak confidently.