Green’s Dictionary of Slang

macing n.¹

1. cheating, esp. at three-card monte.

1832		Satirist (London) 8 July 223/2: George Hassell offers himself as flat-catcher to the club [...] having had experience in plucking and macing, he might be useful if be could be kept sober.
1845		G.W.M. Reynolds Mysteries of London vol. 2 142: Macing Swindling.
1915		Lincoln (NE) Daily News 2 Aug. 3-A: All o’ dis stuff puts de macin’ gag t’ de friz.
1977		D. Powis Signs of Crime 192: Macing Stealing or cheating (especially at the three-card trick).

In compounds