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Phonetics
/ˈkwɒdɹʊpl/
/kwɑˈdɹupəl/
verb
To multiply by four.
Example: Quadrupling four gives sixteen.To increase by a factor of four.
Example: Our profits quadrupled when we made the improvements.To provide four parallel running lines on a given stretch of railway.
adjective
Being four times as long, as big or as many of something.
Example: He's quite an athlete and can do quadruple jumps with ease.