The pointed or tapered end of something is its tip. There's the tip of your dog's wagging tail, the tips of your fingers, or the tip of the continent of South America.
When you can almost remember someone's name, you might say it's on the tip of your tongue, and when something's just "the tip of the iceberg," it's only one small bit of a much larger problem. Other meanings of tip include "tilt," like when you tip your hat as you stroll down the street, and "gratuity," or the extra money you give a waiter or barber in exchange for good service.
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