ˈdänēˌbru̇k, -niˌ- noun
also donnybrook fair
Usage: often capitalized D
Etymology: from Donnybrook Fair, an annual event known for its brawls held in Donnybrook, suburb of Dublin, Ireland
1. : an uproarious brawl : free-for-all
2. : a rowdy contention between rival forces carried on in public (as in legislative halls and public print)