男主外，女主内

男主外，女主內
nánzhǔwài,nǚzhǔnèi
men go out to work and women stay at home (idiom)

CEDICT

Entry Composition

1 男主 nánzhǔ
  1. (neologism, slang, colloquial) male protagonist (of a story, drama, etc.)
  2. male protagonist (of a story, drama, etc.)
2 外 wài
  1. outside
  2. in addition
  3. foreign
  4. external
3 女主 nǚzhǔ
  1. (neologism, slang, colloquial) female protagonist (of a story, drama, etc.)
  2. female protagonist (of a story, drama, etc.)
4 内 nèi
  1. inside
  2. inner
  3. internal
  4. within
  5. interior