etymology uncertain; nothing similar recorded in Old English;
but cf. Goth. afhwapjan to choke, which would be in Old English *ofhwęppan
c 1300 - King Alisaundre;
see below From: Metrical Romances of the Thirteenth, Fourteenth,
and Fifteenth Centuries
Edited by Henry William Weber
Volume I. 1810
Kyng Alisaunder. Part I.