相偕

xiāng xié yī bèi zi

相偕一辈子

keep each other company all their lives

xiāng xié chū xíng

相偕出行

go on a tour together

liǎng rén chū rù xiāng xié xíng yǐng bù lí

两人出入相偕，形影不离。

The two are always together and inseparable like shadows.