Real Dictionary

stalk
countable noun: The stalk of a flower, leaf, or fruit is the thin part that joins it to the plant or tree.
verb: If someone stalks someone else, especially a famous person or a person they used to have a relationship with, they keep following them or contacting them in an annoying and frightening way.
verb: If you stalk a person or a wild animal, you follow them quietly in order to kill them, catch them, or observe them carefully.

stalk in American English 1
to walk in a stiff, haughty, or grim manner
noun: the stem or main axis of a plant

stalk in American English 2
any stem or stemlike part, as a slender rod, shaft, or support
intransitive verb: to pursue or approach prey, quarry, etc., stealthily
noun: an act or course of stalking quarry, prey, or the like
transitive verb: to pursue (game, a person, etc.) stealthily

stalk in British English 1
noun: the main stem of a herbaceous plant

stalk in British English 2
noun: the act of stalking
verb: to follow or approach (game, prey, etc) stealthily and quietly