Definition of storm flag
1 : a small national flag flown (as at a U.S. Army post) only in stormy weather and measuring usually 9 feet 6 inches by 5 feet
2 : a square red flag with a square black center displayed singly, in pairs, or in combination with various pennants to indicate the approach of a storm
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up storm flag? Please tell us where you read or heard it (including the quote, if possible).