Ancient: /molɔ̀ːn labé/. Modern… ah, screw that, it’s not Modern Greek.
Literally, molōn is the past (aorist) participle of blōskō, the non-Attic verb for “come, go”. In this case, “having come”, meaning “when you have come”.
labe is the imperative aorist of lambanō, meaning “take”.
So “having come, take!” literally. More idiomatically, “come and get them!”
All this, and more detail, available at https://en.wikipedia.org/wiki/Mo….