Green’s Dictionary of Slang

1. to exclude someone from a deal or organization.

1965		G. Melly Owning Up (1974) 114: Poor Mike [...] for whom the London Palladium was holy ground, was yet again rowed out.
2000		J.J. Connolly Layer Cake 207: We’ve got a fuckin deal, you Russian cunts, and now you’re trying to row me out.
2011		J.J. Connolly Viva La Madness 391: Maybe you were [...] planning to row me out.

2. to exonerate a suspect.

1970

‘Metropolitan Police Sl.’ in P. Laurie Scotland Yard (1972) 327: row in, or out, to: to make an action implicating or exonerating a person from a crime in the eyes of a third party.