同病相怜 (tóng bìng xiāng lián) | Meaning: fellow sufferers empathize with each other (idiom); misery loves company | Chinese Idiom with Pinyin & Origin

cross a river in the same boat (idiom); fig. having common interests · obliged to collaborate towards common goals同舟共济tóng zhōu gòng jì

go through thick and thin together · share a common fate · cast (in) one's lot with somebody · throw in one's lot with somebody患难与共huàn nàn yǔ gòng

to take pity on · pity · mercy怜悯lián mǐn

fellow sufferers empathize with each other (idiom); misery loves company