What does drag mean in the context of a bull being chained to a drag? [closed]

My question comes after reading the William Carlos Williams' poem The Bull:

"...chained / to a drag / the bull is godlike"

I would be very grateful for an explanation. Thank you!


According to the OED, "drag" can be short for "drag-harrow":

A heavy kind of harrow used for breaking up ground or breaking clods; a drag-harrow.

(This sense is marked as "historical" in some other dictionaries.)

One site sells drag harrows and they look like this:


a drag OED

  1. Something that drags, or hangs heavily, so as to impede motion.

As in:

the bull is impeded for safety, but allowed to graze.

chained bull