打得火热 (dǎ de huǒ rè) — (idiom) to be very close, often romantically involved; to be thick as thieves

Definition

Examples

• 他们两个人最近打得火热，每天都在一起。
  Tā men liǎng gè rén zuì jìn dǎ de huǒ rè, měi tiān dōu zài yì qǐ.
  The two of them have been very close recently, spending every day together.
• 听说小王和小李打得火热，可能已经在谈恋爱了。
  Tīng shuō xiǎo wáng hé xiǎo lǐ dǎ de huǒ rè, kě néng yǐ jīng zài tán liàn ài le.
  I heard that Xiao Wang and Xiao Li are very close, maybe already dating.
• 刚认识那几天他们就打得火热，像老朋友一样。
  Gāng rèn shi nà jǐ tiān tā men jiù dǎ de huǒ rè, xiàng lǎo péng you yí yàng.
  In the first few days after meeting, they became very close, like old friends.