In the vernacular, this verb is unique to this single attestation and should probably be interpreted either as an aphetic form of empenné
or a verbal construct from the adjective penné. It is, however, also found in thirteenth-century medieval Latin.
v.a.
1weaponsmil.(of an arrow shaft) to feather, fletch (an arrow or quarrel):
(
1323-25
)
soit maundé as divers viscountes pur faire purveance de pennes des ouwes a la mountance de cent mil ou la environ pur penner quarreux et setes pur esparnier parchemin qe autrement covendroit estre despendu en cel oeps
66
penner1 (1323-25)