go through thick and thin together
还有很多，比如：
share sb.'s joys and sorrows; partake in each other's joys and sorrows; share happiness and sufferings; share joys and hardships; share satisfactions and hardships; share the rough and the smooth with sb.; share weal and woe; share with sb. both prosperity and adversity; share with sb. sweets and bitters, weal and woe; take “for better or for worse”; through thick and thin
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