Tip of the Iceberg
Noun Phrase · Slang & Abbreviations
Definitions
The visible part of a much larger underlying problem. In engineering slang, the first weird symptom is often just the tip of the iceberg for a deeper architectural or process issue.
In plain English: A small visible sign of a much bigger problem underneath.
Example: "The failed cron job was only the tip of the iceberg once they discovered how many unrelated reports depended on the same undocumented export path."