say it: WAHSH-bawrd
washboard is a noun meaning "device consisting of a corrugated surface to scrub clothes on". It carries 2 recorded senses.
device consisting of a corrugated surface to scrub clothes on
protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for washboard come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.