To throw with violence: flung the dish against the wall. See Synonyms at throw. To put or send suddenly or unexpectedly: troops that were flung into battle. To throw (oneself) into an activity with abandon and energy. To cast aside; discard: fling propriety away. To move quickly, violently, or impulsively. The act of flinging. A brief period of indulging one's impulses. See Synonyms at binge. Informal A usually brief attempt or effort: You take a fling at it. A brief sexual or romantic relationship.