We found one dictionary that defines the word bumper crops:

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1. bumper crops: Wiktionary

▸ Words similar to bumper crops ▸ Usage examples for bumper crops ▸ Idioms related to bumper crops ▸ Wikipedia articles (New!) ▸ Words that often appear near bumper crops ▸ Rhymes of bumper crops ▸ Invented words related to bumper crops