We found one dictionary that defines the word common grave:

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1. common grave: Wiktionary

Definitions from Wiktionary (common grave) ▸ noun:  Synonym of potter's field ▸ Words similar to common grave ▸ Usage examples for common grave ▸ Idioms related to common grave ▸ Wikipedia articles (New!) ▸ Words that often appear near common grave ▸ Rhymes of common grave ▸ Invented words related to common grave