The main stems or support structures of plants, or the act of following someone secretly to watch or threaten them.
From Old English 'stælc' meaning 'stalk of a plant'; the verb meaning 'to pursue' developed later, possibly from the idea of hunters stalking prey by moving stealthily like a plant stem bends in wind.
Plants don't have brains, but their stalks are incredibly smart—they can sense gravity, light, and touch, and respond by growing in specific directions to maximize sunlight and find water without moving.
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