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To become greater or larger: "the chief executives ... saw the combined value of their share options upsize by $36.6 million on the day [the] layoffs were announced” ( The Economist).
(verb-intransitive)
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To make greater or larger: "My plan will ... upsize the amount of money Americans get to keep” ( Bob Dole).
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.