[古语、书面语]
vt.
担保，保证，对…负责：
He offered to avouch his innocence with his sword.
他表示愿以剑来保证他是无辜的。
宣布…为真实的；断言；肯定地说，有根据地说；确证；主张：
Millions were ready to avouch the exact contrary.
亿万人愿断言事实恰恰相反。
(公开)承认，自认；供认：
to avouch one’s guilt
供认自己有罪，认罪
vi.
做出保证(for):
做出保证(for)