We found one dictionary that defines the word crushed rocks:

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1. crushed rocks: Vocabulary.com

(Note: See crushed_rock as well.)

Definitions from WordNet (crushed rock) ▸ noun:  rock fragments and pebbles ▸ Also see crushed_rock ▸ Words similar to crushed rocks ▸ Usage examples for crushed rocks ▸ Idioms related to crushed rocks ▸ Wikipedia articles (New!) ▸ Words that often appear near crushed rocks ▸ Rhymes of crushed rocks ▸ Invented words related to crushed rocks