Simple past tense and past participle of grass.(verb)
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Use "grassed" in a sentence
"It's highly likely that Blears would spend considerable energy on finding out who 'grassed' - rather than establishing the ethical credentials of those that she placed her business with."
"That's a myth, the Emirates is bigger if you're referring to the grassed area."
"The CRP continuous sign-up allows producers to enroll certain high priority practices such as grassed waterways, filter strips, and riparian buffers at any time during the year."