Etymology 1

Noun

1. A movable covering for the mouth and chin on a close helmet.
   • 1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page 8:

     Some close helmets have a farther improvement called a bever, the bever when closed covers the mouth and chin, and either lifts up by revolving on the same pivots as the visor, or lets down by means of two or more pivots on each side near the jaws, in which case the bever consists of several laminæ or plates, one shutting over the other.

Etymology 2

Noun

1. A drink.
2. A snack or light refreshment between meals.

   • 1604:"Thirty meals a day and ten bevers" — Christopher Marlowe, Dr. Faustus, page 29
   • 1980: “Very softly I boiled water, made a sandwich from the remains of the luncheon roast chicken, scalded the Twining creature. Then I softly carried my bever to the study on a tray” — Anthony Burgess, Earthly Powers

Verb

1. To shiver.
   • 1485, Sir Thomas Malory, Le Morte D'Arthur, page 25:

     Wherefore King Ban and King Bors made them ready, and dressed their shields and harness, and they were so courageous that many knights shook and bevered for eagerness.