1. ridged wooden or metal boards used for washing clothes by rubbing them against the surface
Usage: historical
2. corrugated road surfaces with parallel ridges that cause vehicles to vibrate
Usage: informal
3. well-defined abdominal muscles with visible ridges
Usage: slang

Examples

• My grandmother used old washboards to scrub clothes before washing machines existed.
• The museum displayed antique washboards from the 1800s.
• The dirt road had developed washboards that made driving uncomfortable.
• Heavy truck traffic created washboards on the gravel surface.
• After months of training, he developed impressive washboards.
• The fitness instructor showed off his washboards during the workout demonstration.