the state of living in a wretched hovel or in conditions of great destitution

他虽然出身于筚门闺窦，最终却凭借努力成就了一番事业。

a crude dwelling with a door made of woven wicker and a window consisting of a hole in the wall

即便居住在筚门闺窦，他也依然保持着乐观的生活态度。