Simple past tense and past participle of impound.(verb)
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Use "impounded" in a sentence
"If she doesn't want to do this, then she can keep the car and drive it taking the chance that it can always be impounded, which is NOT likely to happen unless she has an accident or commits a serious infraction."
"Or she could have ordered the court file "impounded" and stuffed in a safe or written the opinion using only the parties 'initials."
"Shone's car was "impounded" at Tsvangirai residence and he was accused of touring the provinces to campaign for Biti in a bid to challenge Tsvangirai's position at the party's 2011 elective congress."