The act of one who labors; toil; work done.
To toil, to work.
To belabour, to emphasise or expand upon (a point in a debate, etc).
I think we've all got the idea. There's no need to labour the point.
To be oppressed with difficulties or disease; to do one's work under conditions which make it especially hard or wearisome; to move slowly, as against opposition, or under a burden.
To suffer the pangs of childbirth.
To pitch or roll heavily, as a ship in a turbulent sea.