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tip of the iceberg noun

  /ˈtɪp‿əv ði ˈaɪsbɝɡ/ , /ˈtɪp‿əv ðiː ˈaɪsbɜːɡ/
  • (idiomatic) A small indication of a larger possibility; the first part encountered of a problem that is much bigger than it seems.
 氷山の一角
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