three·some
noun/ˈθriːsəm/
/ˈθriːsəm/
- [countable + singular or plural verb] a group of three people
三人一组；三人小组 - They became an inseparable threesome.
他们成了形影不离的三人组。
- They became an inseparable threesome.
- [countable] an occasion when three people have sex together
三人性爱