aver that…|aver something|+ speechto state clearly and strongly that something is true断言;确认synonymassert,declare
She averred that she had never seen the man before.她斩钉截铁地说以前从未见过这个男人。
Word Originlate Middle English (in the sense ‘declare or confirm to be true’): from Old French averer, based on Latin ad ‘to’ (implying ‘cause to be’) + verus ‘true’.