To persist in doing something; to continue to repeat an action after the original stimulus has ended.
To cause the perseveration of (a given reflex or response).
To do something until it is finished; to continue working on (something) until it is finished.
To provide support or cooperation to (a person) throughout a period of time; to support someone through a difficult time.
To constitute ample supply for one for.
To not be deceived by something that is false or misleading; to understand the hidden truth about someone or something.
To recognize someone's true motives or character.
To perceive visually through something transparent.