The word "overdyer" is spelled with four syllables: /ˌoʊ-vər-dahy-er/. The first syllable "oʊ" sounds like the "o" in "boat", while the second syllable "vər" rhymes with "fur". The third syllable "dahy" is pronounced like "dye" (as in coloring fabric), and the final syllable "er" sounds like the "er" in "her". "Overdyer" is a person or machine that dyes a material excessively, causing it to become darker than intended.