To Stalk

1. (transitive) To approach slowly and quietly in order not to be discovered when getting closer.
2. (transitive) To (try to) follow or contact someone constantly, often resulting in harassment.^Wp
3. (intransitive) To walk slowly and cautiously; to walk in a stealthy, noiseless manner.
4. (intransitive) To walk behind something, such as a screen, for the purpose of approaching game; to proceed under cover.
5. (intransitive) To walk haughtily.