隔岸觀火 [－－观－]

Jyutping gaak3 ngon6 gun1 fo2
Pinyin gé àn guān huǒ

Definitions (CC-CEDICT)

to watch the fires burning across the river
to delay entering the fray until all others have been exhausted by fighting amongst themselves (idiom)

Definitions (粵典–words.hk)

動詞
遠離並且旁觀紛爭
to watch conflict happening from afar

Definitions (Wiktionary)

phrase, figuratively, idiomatic
to delay entering the fray until all others have been exhausted by fighting amongst themselves

Definitions (Kaifangcidian)

（沒有對應漢語詞彙）