昆仲 (kūnzhòng): (literary) brothers

Meanings

Tāmen èr rén shì qīn kūnzhòng.

The two of them are blood brothers.

Xìn zhōng xiàng nín jí kūnzhòng wènhǎo.

In the letter I send regards to you and your brothers.

register

Literary and old-fashioned. In modern speech use 兄弟 (xiōngdì, brothers); 昆仲 mostly survives in formal letters and obituaries.

memory

昆 originally means 'elder brother' (as in 昆季) and 仲 means 'second/middle' — the pair literally encodes 'older and younger.'

昆 kūn

仲 zhòng