huàn nàn yǔ gòng 患难与共 to go through thick and thin together

Dialogue –

A: Tā men fū qī liǎ zǒng shì xíng yǐng bù lí.
他们夫妻俩总是形影不离。
This couple is always inseparable.

B: Dāng rán. Tā men liǎ huàn nàn yǔ gòng yì qǐ shēng huó le wǔ shí nián le.
当然。他们俩患难与共一起生活了五十年了。
Of course. Both of them have gone through the tick and thin together for 50 years already.