i·ron·clad
adjective/ˈaɪənklæd/
/ˈaɪərnklæd/
- so strong that it cannot be challenged or changed
铁定的；不容置疑的 - an ironclad alibi/contract/excuse/guarantee
无懈可击的不在犯罪现场证明；铁定的合同；滴水不漏的理由；斩钉截铁的保证 - His memo is ironclad proof he was involved.
他的备忘录是他参与其中的铁证。
Oxford Collocations DictionaryIronclad is used with these nouns:- alibi
- guarantee
- warship
- …
- an ironclad alibi/contract/excuse/guarantee