impounding im·poun·ding US/ˌɪˈmpaʊndɪŋ/ uncommon noun 1. placing private property in the custody of an officer of the law Synonymsimpoundmentinternmentpoundage Related words Word family poundimpound Broader terms seizure Narrower terms drug bust WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.