The Vietnamese word "đại hồng thủy" refers to a "deluge," which means a large amount of water that suddenly floods an area or a very heavy rainstorm. It can also describe a situation where there is a significant overflow of water, often causing damage or destruction.
In literature or more poetic contexts, "đại hồng thủy" can be used metaphorically to describe overwhelming emotions or situations, much like a flood of feelings or events.