Third-person singular present tense of decuple, or plural noun form meaning multiple tenfold amounts.
From the base 'decuple' with standard English verb conjugation or pluralization '-s' suffix.
The word 'decuples' shows how English reuses the same word for both 'he/she decuples it' (verb) and 'multiple decuples' (noun plural), which is a nifty efficiency in language.
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