A noisy and disordered fight conducted without rules.
Synonyms:brawl.
2.
Hence: Any vigorous competition in which anyone can compete, with few or no rules, and in which the winner is unpredictable; as, when they began to distribute the free food, the orderly line of hungry recipients degenerated into a free-for-all.
... perfected for a grand free-for-all race, for the championship of the school. The affair will be in the nature of a handicap, and there will be three prizes, for the first, second and third winners. Any boy in the school may enter, and there will be no fee collected. The race will take place Saturday afternoon on ... — Frank Roscoe's Secret • Allen Chapman