火熱

fiery / burning / fervent / ardent / passionate

fire / urgent / ammunition / fiery or flaming / internal heat (Chinese medicine) / hot (popular) / classifier for military units (old) / Kangxi radical 86

to warm up / to heat up / hot (of weather) / heat / fervent

deep water and scorching fire / abyss of suffering (idiom)

(idiom) to be on very good terms with each other / to hit it off with sb / to be passionately in love with each other / to carry on intimately with / (of trading, conflict etc) to be in full swing