(idiom) to refrain from going too far; to know when to stop
Definitions (粵典–words.hk)
語句
做到適量就應該停,唔應該做過龍 to not overdo something; to stop before going too far
你飲酒應該適可而止,唔可以過量。
你饮酒应该适可而止,唔可以过量。
nei5 jam2 zau2 jing1 goi1 sik1 ho2 ji4 zi2, m4 ho2 ji5 gwo3 loeng6. You should mind how much alcohol you drink. You can't drink too much.
Definitions (Wiktionary)
phrase, idiomatic
to stop when appropriate; not to overdo; enough is enough