Em chồng chị dâu

Direct English translation

The husband's younger brother and the elder brother's wife.

Equivalent English version

Familiarity breeds contempt

Giải thích tiếng Việt
Chỉ mối quan hệ thường dễ nảy sinh va chạm, khó hòa hợp giữa em trai của chồng chị dâu; cũng dùng để nói những cảnh ngộgần nhau hay xung khắc.
English explanation
Refers to a relationship that is often seen as prone to friction and difficult to keep harmonious, especially between a husband's younger brother and his sister-in-law. It is also used more broadly for people living close together who tend to clash.