Definition of running block
: a movable pulley block that rises or sinks with the weight that is raised or lowered —distinguished from standing block
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 running block? Please tell us where you read or heard it (including the quote, if possible).