aver [əˈvɜ:(r)]

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vt.极力声明；断言；确证

to state the truth of something strongly

I aver it will not rain tomorrow. 我断言明天不会下雨。
In spite of all you say, I still aver that his report is true. 不管你怎么说，我还是断言他的报告是真实的。