Yanamino小洞不补大洞吃苦
xiǎo dòng bù bǔ dà dòng chī kǔxiaodongbubudadongchiku
- A small hole not plugged will make you suffer a big hole (idiom); a stitch in time saves nine
Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences