subs. (colloquial).A drone: cf. SLUG. Hence as verb. (or TO GO AT A SNAILS PACE or GALLOP) = to move very slowly.
1582. STANYHURST, Æneid, iv. 689. This sayd shee trots on SNAYLING, lyk a toothshaken old hagge.
1593. SHAKESPEARE, Comedy of Errors, ii. 2, 196. Thou drone, thou SNAIL, thou slug, thou sot.
1725. N. BAILEY, trans. The Colloquies of Erasmus, i. 73. I see what Haste you make, you are never the forwarder, you go A SNAILS GALLOP.
1748. RICHARDSON, Clarissa, iv. 124. SNAIL ON in a track we are acquainted with.
1821. COMBE, Dr. Syntax, III. iii. He, by degrees, would seldom fail T adopt THE GALLOP OF A SNAIL.