The term 'flood out' can be summarized by the word 'GUSH, ' which is a four-letter word. GUSH means to flow or issue forth suddenly and in large quantities, which is what happens when a flood occurs. Floods are caused by heavy rains or melting snow that cause rivers and streams to overflow their banks, resulting in flooding of low-lying areas. Flooding can cause significant damage to property and can even lead to loss of life.