Onrush refers to a sudden and powerful forward movement or rush. It can also imply a rapid and overwhelming flow of something, like emotions or water. In the context of the clue "Deluge," onrush might refer to a sudden and intense flood or overwhelming surge of water.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Deluge. Explanations are generated by AI and may be inaccurate.