Top of Form 1
According to Meriam Websters Collgiate Dictionary it gives it an old English
origin
Bottom of Form 1
Main Entry: hal·low Pronunciation: 'ha-(")lO
Function: transitive verb
Etymology: Middle English halowen, from Old English hAlgian, from hAlig holy
-- more at HOLY <dictionary?book=Dictionary&va=holy>
Date: before 12th century
1 : to make holy or set apart for holy use
2 : to respect greatly : VENERATE <dictionary?book=Dictionary&va=venerate>
synonym see DEVOTE <dictionary?book=Dictionary&va=devote>