Rack Punch
From The Oxford Companion to Spirits & Cocktails
is shorthand for Arrack Punch. See Arrack Punch. The antiquated, eighteenth-century colloquialism crops up in Thackeray’s Vanity Fair as well as in Jerry Thomas’s How to Mix Drinks. See also Thomas, Jeremiah P. “Jerry.”
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).