What does the Sanskrit word punardarśanāya mean in English?

It means "See you gain" even though lit it need be translated as "for the pupose of seeing you gain" this is how one takes leave of someone in Sanskrit.

The sequence of the conversation would run like this:

Rama: sAdhyAmaH-tAvat?[Shall I take leave]

Krishna: gamyatam punardarshanAya.