The Cantonese Ambassador teaches us three new idioms. Follow along with the lesson on DIU Pod 55 (starting at the 42:55 mark).
識途老馬 (sik1 tou4 lou5 maa5)
A very experienced person. Literal translation: knowing road, old horse
亡羊補牢 (mong5 joeng4 bou2 lou4)
To avoid worse losses if something goes wrong. Literal translation: busy, sheep, repair, cage
殺鷄儆猴 (saat3 gai1 ging2 hau4)
Punishing someone to show others the consequences. Literal translation: kill chicken, warn monkey