Translation:

83. So leave them to babble and play (with vanities) until they meet that Day of theirs which they have been promised.

Notes (Tafseer)

4681. That Day of theirs: they had their Day on earth; they will have a different sort of Day in the Hereafter, according to the promise of Allah about the Resurrection and Judgment, or perhaps about Retribution in this very life! So leave them to play about with their fancies and vanities. Truth must eventually prevail!