quadruple

adj

1. (not-comparable)Being four times as long, as big or as many of something.

   “He's quite an athlete and can do quadruple jumps with ease.”

verb

1. (transitive)To multiply by four.

   “Quadrupling four gives sixteen.”

2. (intransitive)To increase by a factor of four.

   “Our profits quadrupled when we made the improvements.”

   “Overall, consumer spending on fast tech has quadrupled to £11.6bn since 2023, surveys carried out for Material Focus suggested.”

3. To provide four parallel running lines on a given stretch of railway.

   “On June 8, 1872, the London & North Western Railway obtained powers to quadruple its main line, and a new tunnel was bored for the up and down slow lines.”

   “Quadrupling the short remaining stretch of three-track railway north of Rugby, left over by the turn of the century modernisation, is a possibility that could be pursued.”

   “A long-term aspiration is to quadruple the cross-country route between Peterborough and Werrington Junction, removing any conflict between trains on the Spalding and Leicester lines.”

noun

1. Something that is four times the usual number, amount, size, etc.
2. A figure-skating jump with four revolutions in the air.