Definition of "quadruple" in English

adjective

1. 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.

3. (rail transport) To provide four parallel running lines on a given stretch of railway.

noun

1. Something that is four times the usual number, amount, size, etc.

2. (skating) A figure-skating jump with four revolutions in the air.