Green’s Dictionary of Slang

1. to flog a number of people, usu. schoolchildren, at the same time.

1960		Macaw Notebook in Allsopp Dict. Carib. Eng. Usage (1996) 503/1: When you see he come een a bad mood an’ he start to share blows, he does run mih een yard [...] an’ thing.
1996		Allsopp Dict. Carib. Eng. Usage 503/2: share blows/lashes/licks To whip (a class/group/team, etc) mercilessly [by extension] to humilate (an opposing side) publicly.

2. (orig. political) to trounce one’s opposition.

1990

Nation (Bdos) 19 Oct. in Allsopp Dict. Carib. Eng. Usage (1996) 503/1: Dey havin’ nuff meetings ’bout de place [...] and de res’ o’ parties only watin’ til de election campaign start to share some home-truth licks.