That which requires hard work for its accomplishment; that which demands effort.
3
Workers in general; the working class, the workforce; sometimes specifically the labour movement, organised labour.
4
A political party or force aiming or claiming to represent the interests of labour.
verb
1
To toil, to work.
2
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.
3
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.