Ern

dial. form of EARN (see EARN v.¹ 3). So Ernes sb. pl. (see quot.)

1695.  Kennett, Par. Antiq., Gloss., Ernes, the loose scattered ears of corn that are left on the ground after the binding or cocking of it…. Hence to ern is in some places the same as to glean.

1726.  Dict. Rust. (ed. 3), s.v. Ernes.