What is a Nantucket sleigh ride? Here are some definitions.
Noun
(idiomatic) An obsolete and dangerousmethod of whalehunting in which a small boat manned by rowers and a harpooner, or a series of small boats tied together, would be attached to a whale by means of a harpoon and would then be towed by the creature at high speed across the water's surface, until the whale eventually became exhausted.
(idiomatic, by extension) A similar scenario involving a large fish.