We found one dictionary that defines the word empty cows:

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1. empty cows: Collins English Dictionary

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