(transitive, intransitive) To plunge suddenly into water; to duck; to immerse. / (intransitive) To fall suddenly into water. / (transitive) To put out; to extinguish.

(obsolete, colloquial or slang) Fashionable, tip-top. / (obsolete, colloquial or slang, absolute, with the) In the height of fashion, excellent, cool. / (colloquial or slang) Clever, neat, smart.

One that piggybacks.

(mathematics) Dividing into three parts.