huàn nàn jiàn zhēn qíng
a friend in need is a friend indeed (idiom)
huàn nàn zhī jiāo
a friend in times of tribulations (idiom); a friend in need is a friend indeed
kě gòng huàn nàn
to go through thick and thin together (idiom)
huàn nàn zhī jiāo cái shì zhēn zhèng de péng you
a friend in need is a friend indeed (English proverb)
cf idiom 患難之交|患难之交, a friend in need
huàn nàn jiàn qì
to leave somebody holding the baby
to shrug responsibility (idiom)