the tip of the iceberg
Meaning: You can say something is the tip of the iceberg when it's just a small part of something much bigger.
- The homeless kids who visit us for help are just the tip of the iceberg. There are thousands more we never see.
- The internet is huge. What you can find through search engines is just the tip of the iceberg.
The corruption cases that are brought to court are the tip of the iceberg, and there are