袒胸露臂 bare-chested
Explanation
袒：裸露。敞开上衣，露出胳膊，指没有修养和礼貌。
袒: bare. Open the upper body, showing arms, indicating a lack of cultivation and politeness.
Origin Story
盛夏时节，一位农民在田间辛勤劳作。烈日当空，汗水浸湿了他的衣衫。为了凉快，他脱去了外衣，袒胸露臂地挥舞着镰刀，收割着成熟的麦子。夕阳西下，他拖着疲惫的身躯回家，虽然衣衫褴褛，但脸上却洋溢着丰收的喜悦。
In the height of summer, a farmer worked diligently in the field. The sun was shining brightly, and sweat soaked his clothes. To cool himself down, he took off his jacket and worked with his chest bare, harvesting the ripe wheat with a sickle. As the sun set, he returned home with a weary body, and although his clothes were tattered, his face beamed with joy from the harvest.
Usage
作谓语、定语；指衣冠不整
As predicate, attributive; refers to untidy clothes.
Examples
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他袒胸露臂地坐在那里，显得十分不雅观。
tā tǎnxiōnglùbì de zuò zài nàlǐ, xiǎndé shífēn bù yǎguān.
He sat there bare-chested, looking very unpresentable.
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烈日炎炎下，工人们个个袒胸露臂地挥汗如雨。
lièrìyán yán xià, gōngrénmen gè gè tǎnxiōnglùbì de huī hàn rú yǔ。
Under the scorching sun, the workers were all sweating profusely with their chests bare and working diligently..