G2872 κοπιάω (kopiáō)

KJV renderings: (bestow) labour, toil, be wearied
Strong's definition: to feel fatigue; by implication, to work hard
Derivation: from a derivative of G2873 (κόπος);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.