Green’s Dictionary of Slang

merch n.

[abbr.]

1. the merchant navy.

[US]H. Ellison Deadly Streets (1983) 19: I’ll be shippin’ out inna Merch Marine next Summer.
[UK](con. WW2) T. Jones Heart of Oak [ebook] There’d be nothing— nothing at all, to stop her [...] making sodding mincemeat out of the whole fucking Andrew ... and then her mates Prinz Eugen and Scharnhorst and the rest of’em come out and mash up the merch.
[UK] (con. 1950s) D. Farson Never a Normal Man 177: I joined the merch and it was a right disillusionment.

2. merchandise.

[US]E. Weiner Big Boat to Bye-Bye 63: The merch was sitting on the shelves and not moving.
[UK]J.J. Connolly Viva La Madness 307: You won’t need a loan if we sell this merch back to the Zambrano Family.
[US]J. Callaway ‘Misirlou’ in Pulp Ink [ebook] ‘What about the merch, Ashley?’ ‘Well, there wasn’t a whole lot’.
http://selinakray.net/ 17 Apr. [Internet] If he hadn’t negotiated that vital percentage of the merch, he would have watched the studio print money off his ideas.