laboring

a. 1. That labors; performing labor; esp., performing coarse, heavy work, not requiring skill also, set apart for labor; as, laboring days. [ 1913 Webster ]

The sleep of a laboring man is sweet. Eccl. v. 12. [ 1913 Webster ]

2. Suffering pain or grief. Pope. [ 1913 Webster ]

Laboring oar, the oar which requires most strength and exertion; often used figuratively; as, to have, or pull, the laboring oar in some difficult undertaking. [ 1913 Webster ]