the time which is not clear between afternoon and evening. this period differs from one place to the other due to the spherical shape of earth, hence the reception of sunbeam. the term is coined by Sheldon Cooper, in The Big Bang theory.
ohh.. its 4.30pm. that's pre-evening.. since in the evening i will soak and wash my clothes, so at 4.30pm i will be doing pre-soaking and pre-washing..