a.vouch

avouch的音标和读音：
DJ音标发音： [əˈvautʃ]
KK音标发音： [əˈvaʊtʃ]

avouch的词性：
v.tr.（及物动词）

1. To declare the provable truth or validity of; affirm:
断言：声称是可以证实的事实或其有效性；肯定：

She avouched that she herself was innocent.
她证实了她自己是无辜的

2. To vouch for.
为…证实

3. To accept responsibility for (an action, for example); acknowledge.
承担：为（如某一行为）承担责任；确认

4. To avow; confess.
承认；坦白

avouch的词源：

5. Middle English avouchen [to cite as a warrant]
中古英语 avouchen [作为担保引用]

6. from Old French avochier
源自 古法语 avochier

7. from Latin advoc3re [to summon] * see advocate
源自 拉丁语 advoc3re [召唤] *参见 advocate