To cause or induce displeasure or irritation.
To induce pain in (all or part of a body or organism).
To provoke impatience, anger, or displeasure in.
To annoy or irritate.
To stop.
To serve or behave as a spy or informer.
To complain.
To watch; to observe.
An unpleasant person, especially one who makes things difficult for others.
A police spy or informer.