Simple past tense and past participle of underinflate.(verb)
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Use "underinflated" in a sentence
""The tire suffered from long-term underinflated operation and had been damaged by a road hazard impact," Cooper Tire said, adding "this tire was not defective and that plaintiffs did not prove that any tire defect caused this accident.""
"If the tires are underinflated or overloaded in high temperature environments, the belt edges may separate."
"Severe internal tire damage or outright tire failure can occur when an underinflated tire is driven at typical highway speeds."