Sled Dog
Noun · Slang & Abbreviations
Definitions
A dependable system or person that keeps pulling heavy operational load without much glamour. In engineering slang, a sled dog is respected because the boring work still has to move.
In plain English: A dependable workhorse that keeps carrying heavy load.
Example: "The old ETL job was a sled dog, ugly but reliable, dragging huge chunks of reporting data every night for years."