Definition from macmillandictionary.com
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He has continued to assert his innocence.
The governor asserted that no more money would be available.
She always manages to assert her point of view.
Don’t be so shy – you need to learn to assert yourself.
This system discourages people from asserting their rights in court.
He quickly asserted his authority as a leader.
It’s hard for shy people to assert themselves in a group.
After a while her old bad habits began to assert themselves.