lagger

/ˈlæɡər/
noun
  1. A person or thing that lags behind; someone who is slow or falls behind others.
    • In the marathon, the laggers received encouragement from the crowd.
    • The hikers waited for the laggers to catch up before continuing.
    • The teacher gave extra attention to the laggers in the reading group.
Antonyms
What does "lagger" mean? | whatsthatwordmean | whatsthatwordmean