The visible or obvious part of a larger, hidden problem or situation.
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The small part you can see of a much bigger hidden problem.
The tip of the iceberg is what shows on the surface, while the real trouble sits below.
It is used to warn that what you see is only a sliver of the whole.
"Just the Surface"
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Looking only at the most obvious, superficial level of something without deeper examination
"A Drop in the Ocean"
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A very small contribution compared to the vast scale of what is needed
"The Tip of the Iceberg"
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The small visible part of a much larger hidden problem or situation