(a1) in glasswork, the effect produced by spraying a pane with a dilute acid. (jargon, contraction of mottled etching) [sjm]
(a2) Rapid etching process that enjoyed a brief vogue among hobbyists in the late 19th century; artwork produced by this process. [Bingley]
(a) in glasswork, a rapid etching process that enjoyed a brief vogue among hobbyists in the late 19th century; the effect produced by spraying a pane with a dilute acid (jargon, contraction of mottled etching) [sjm/Bingley/tsuwm] Faldage, WO'N, rav (3 votes)

(b) the serrated-jaw assembly that forms part of the cable gripping and tightening mechanism on the drum of a steam-ploughing engine [dxb] Wordwind, ASp, wofa (3 votes)

(c) from mediaeval England, originally mutching or mowching (these are probably regional variations); it meant the seeking of alms by Friars of the mendicant orders, but has come to mean begging by anyone and has acquired a connotation of lurking with evil intent, or to avoid work (the Welsh version is "mwchyms" (pron. "moochums") which is (or was) commonly used to mean playing truant from school) [RC]

(e) pronounced mot-ching', a venerable Chinese game played with ivory tiles; the Western pronunciation has evolved over time and the game is now widely known as "Mah Jongg" or equivalent spelling [wofa] consuelo

(f) a solid-color quilt border [TEd] sjm, bonzai, musick (3 votes)

(g) poetic translation of ancient Chinese secrets [consuelo]

(h) the act of mooching over your tea [bonzai]

(i) the act of challenging the major point of contention in a written debate by publicly pointing out a minor misspelling (in internet format this tactic has been adapted as a mutually understood concession) [milum] milum (and all is right with the whorl)

(j) the act of lying: prevarication [musick] RhubarbC

(k) the practice of cutting leeches during surgical application to empty them of blood and increase suction [tsuwm]

(l) nonce word coined for SUVs, which need larger parts: similar to notching, but the notches are cut twice as large and twice as far apart; c.f. m and n spaces in typography [ASp]

(m) to produce (as a pattern or design) on metal by eating into the surface with a laser beam [Wordwind] dxb

(n) the under-soil of a sod farm [WO’N] etaoin

(o) the name for what happens when a bunch of guys get together and try to out-macho each other [Jeepers]

(p) a coarse twill cloth made of a mixture of linen and cotton [Faldage] teD, Bingley

(q) fond of dainties, with the idea of eating in secret; (also) slow, quiet eating, with the idea of fondness for good living; imperceptible use, with the notion of thriftlessness [Joseph Wright's English Dialect Dict. 1896-1905] Jeepers

Jeepers! I had the panel stumped up until the very last vote!

snufflingly yours,
-joe hogget

oh, and kudos to dxb, TEd and the sjm/Bingley consortium for all amassing 3 votes each.