A heavy load.
A responsibility, onus.
A cause of worry; that which is grievous, wearisome, or oppressive.
The capacity of a vessel, or the weight of cargo that she will carry.
The tops or heads of stream-work which lie over the stream of tin.
The proportion of ore and flux to fuel, in the charge of a blast furnace.
A fixed quantity of certain commodities.
A birth.
The total amount of toxins, parasites, cancer cells, plaque or similar present in an organism.
A phrase or theme that recurs at the end of each verse in a folk song or ballad.
The drone of a bagpipe.
Theme, core idea.
To encumber with a literal or figurative burden.
To impose, as a load or burden; to lay or place as a burden (something heavy or objectionable).