Jisho

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Noun
1. unexploded ordnance; unexploded shell; unexploded bomb; UXO
Wikipedia definition
2. Unexploded ordnanceUnexploded ordnance (or UXOs/UXBs, sometimes acronymized as UO) are explosive weapons that did not explode when they were employed and still pose a risk of detonation, potentially many decades after they were used or discarded. While "UXO" is widely and informally used, munitions and explosives of concern (MEC) is the current preferred terminology within the remediation community.
Read “Unexploded ordnance” on English Wikipedia
Read “不発弾” on Japanese Wikipedia
Read “Unexploded ordnance” on DBpedia

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