flashflood Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a sudden local flood of great volume and short duration Example Sentence A flashflood watch remains in effect for much of Alabama. Spelled as one word. Synonyms heavy rain; downpour; localized downpour Antonyms sunshine Hear It! Say It! Write It! flashflood Switch to cursive Start Share with your friends: