halsing

Then Balin looked into a fair little garden, and under a laurel tree he saw her lie upon a quilt of green samite and a knight in her arms, fast halsing either other, and under their heads grass and herbs.

Le Morte Darthur: Sir Thomas Malory's Book of King Arthur and of his Noble Knights of the Round Table, Volume 1 1903

a knight in her arms, fast halsing either other, and under their heads grass and herbs.

Le Morte d'Arthur: Sir Thomas Malory's book of King Arthur and of his noble knights of the Round table 2003