subs. (common).Swindling.
1821. P. EGAN, Tom and Jerry, p. 118. The no-pinned hero, on being elevated, gave, as a toast, Success to FLAT-CATCHING, which produced roars of laughter and shouts of approbation.
1869. GREENWOOD, The Seven Curses of London. To mark the many kinds of bait that are used in FLAT-CATCHING, as the turf slang has it.