To impose, as a load or burden; to lay or place as a
burden (something heavy or objectionable).

The verse repeated in a song, or the return of the theme at
the end of each stanza; the chorus; refrain. Hence: That which is often
repeated or which is dwelt upon; the main topic; as, the burden of a
prayer.

A fixed quantity of certain commodities; as, a burden of
gad steel, 120 pounds.

To oppress with anything grievous or trying; to
overload; as, to burden a nation with taxes.

A birth.

The proportion of ore and flux to fuel, in the charge of a
blast furnace.

That which is borne with labor or difficulty; that which is
grievous, wearisome, or oppressive.

That which is borne or carried; a load.

The capacity of a vessel, or the weight of cargo that she
will carry; as, a ship of a hundred tons burden.

To encumber with weight (literal or figurative); to lay
a heavy load upon; to load.