We found one dictionary that defines the word upsizable:

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1. upsizable: Wiktionary

Definitions from Wiktionary (upsizable) ▸ adjective:  Able to be upsized. ▸ Words similar to upsizable ▸ Usage examples for upsizable ▸ Idioms related to upsizable ▸ Wikipedia articles (New!) ▸ Popular nouns described by upsizable ▸ Words that often appear near upsizable ▸ Rhymes of upsizable ▸ Invented words related to upsizable