We found one dictionary that defines the word downcurve:

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1. downcurve: Wiktionary

Definitions from Wiktionary (downcurve) ▸ noun:  A downward curve ▸ Words similar to downcurve ▸ Usage examples for downcurve ▸ Idioms related to downcurve ▸ Wikipedia articles (New!) ▸ Popular adjectives describing downcurve ▸ Words that often appear near downcurve ▸ Rhymes of downcurve ▸ Invented words related to downcurve