Definitions from Wiktionary (quadruple)

▸ adjective:  Being four times as long, as big or as many of something.
▸ verb:  (transitive) To multiply by four.
▸ verb:  (intransitive) To increase by a factor of four.
▸ verb:  (rail transport) To provide four parallel running lines on a given stretch of railway.
▸ noun:  Something that is four times the usual number, amount, size, etc.
▸ noun:  (skating) A figure-skating jump with four revolutions in the air.
▸ Also see quadruple

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