re ‧ as ‧ sert /ˌriːəˈsɜːt $ -ˈsɜːrt/ BrE AmE verb [transitive]
1 . reassert your authority/power/control to do or say something to make your position stronger after a period when it seemed weak:
The Prime Minister aimed to reassert his authority.
2 . to state a fact or opinion again, often more strongly or more clearly:
He used the opportunity to reassert his position on energy policy.
3 . reassert itself if something reasserts itself, it returns or becomes stronger after a period when it was missing or weak:
At last, common sense had reasserted itself.