We found one dictionary that defines the word overmarking:

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1. overmarking: Wiktionary

Opposite: undermarking, underrating, undervaluing, underestimating ▸ Words similar to overmarking ▸ Usage examples for overmarking ▸ Idioms related to overmarking ▸ Wikipedia articles (New!) ▸ Words that often appear near overmarking ▸ Rhymes of overmarking ▸ Invented words related to overmarking