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combine to double size▼verb
double [doubled, doubling, doubles]▼verb[UK: ˈdʌb.l̩] [US: ˈdʌb.l̩]
employ in repeated action▼verb
increase [increased, increasing, increases]▼verb[UK: ɪn.ˈkriːs] [US: ˌɪn.ˈkriːs]
redouble [redoubled, redoubling, redoubles]▼verb[UK: rɪ.ˈdʌb.l̩] [US: ri.ˈdʌb.l̩]
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