Green’s Dictionary of Slang

(Scot.) to fight; thus swedging n., fighting.

1993		I. Welsh Trainspotting 3: Auld Jean-Claude’s ready tae git doon tae some serious swedgin.
2012		(con. 1980s) I. Welsh Skagboys 146: Wisnae gaunny go swedgin wi the cunt in the fuckin Walk, wis ah?
2018		I. Welsh Dead Man’s Trousers [24]: After some minor scuffles, the polis gets in between the small groups of would-be swedgers.