顺水人情

shùnshuǐrénqíng

顺水人情 — shùnshuǐrénqíng

1. to do someone a favor at little cost; to help someone with minimal effort or expense

   他经常给朋友顺水人情，帮他们跑腿。 tā jīngcháng gěi péngyǒu shùnshuǐrénqíng bāng tāmen pǎotuǐ — He often does small favors for his friends, running errands for them.