coverall

/ˈkʌvərˌɔl/
noun
  1. A one-piece protective garment worn over regular clothes to keep them clean, often used for work or messy activities.
    • The mechanic put on a blue coverall before starting to repair the engine.
    • She wore a white coverall while painting the kitchen to avoid getting paint on her clothes.
    • The lab technician's coverall had multiple pockets for holding tools and test tubes.
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