Emily Dickinson Lexicon

CAP, v.t.

1. To cover the top, or end; to spread over; as, a bone is capped at the joint with a cartilaginous substance. The cloud-capped towers. – Shak.
2. To deprive of the cap, or take off a cap. To cap verses, is to name alternately verses beginning with a particular letter; to name in opposition or emulation; to name alternately in contest. – Johnson.