1. 重申（地位、权力等）
If you reassert your control or authority, you make it clear that you are still in a position of power, or you strengthen the power that you had.

2. （想法、习惯等）再次显现，再次出现
If something such as an idea or habit reasserts itself, it becomes noticeable again.

1. strengthen or make more firm

e.g. The witnesses confirmed the victim's account

Synonym: confirm