0 past simple and past participle of double
1 to become twice as much or as many, or to make something twice as much or many:
The government aims to double the number of students in higher education within 25 years.
Company profits have doubled since the introduction of new technology.
She's come up with some amazing scheme to double her income.
Consumer spending has more than doubled in the last ten years.
The amount of recycled glass used in manufacture doubled in five years.
Alarmingly, the hole in the ozone layer has doubled in size this year.
When the price of skiing in the mountain resorts doubled, tourists voted with their feet and just stopped going.
Either the grapheme that is doubled is replaced by another grapheme, which then undergoes doubling, or the doubling feature itself is misordered.
If the particle pair survives, the weighting assigned to it is doubled.
By the end of the decade, the latter group had more than doubled its 1965 presence.
