assert
英 [əˈsɜːt]   美 [əˈsɜːrt]  
v.
明确肯定;断言;坚持自己的主张;表现坚定;维护自己的权利(或权威);生效

例句

She continued to assert that she was innocent.

她仍然坚称自己无辜。

I was determined to assert my authority from the beginning.

我决心一开始就维护我的权威。