Insist (verb)

1. To be firmly or stubbornly insistent on a particular point or course of action.
2. To demand firmly or persistently.
3. To state or assert with confidence or emphasis.

Origin:

Late middle english: from latin insistere, from in- "on" + sistere "take a stand".

Examples:

1. He insisted on going to the concert.
2. She insisted on paying for the meal.
3. He insisted that he was right.
4. She insisted that she had done nothing wrong.
5. He insisted on taking the dog for a walk.