1) The verb meant to make an uproar, to argue loudly and contentiously.
1563 I tryst to God that all the breblyng be done, York
1665 there was some brabling betwixt him and some other persons, being got into drink, Northowram. The noun often identified trouble-makers in court cases: c.1602 dronkerds, gaymsters, stealers of wodd and connyes ... brablers, Brandsby
1631 a man of ill behaviour, a brabler and a brawler, Farlington.