Hallow

All Hallows Eve (or Halloween), the night before All Hallows Day (now more commonly known as "All Saints' Day").

To seek hallows: to visit relics or shrines, in the belief that the saints themselves are present there.

[…]I am coming on, to venge me as I may and to put forth my rightful hand in a well-hallow'd cause.

Come hallow the goblet with something more true / Than words we forget in a minute.

[…] for the conversation (if it may be called so) was seldom such as could entertain a lady. It consisted chiefly of hallowing, singing, relations of sporting adventures, b—d—y, and abuse of women, and of the government.

Then away they went from merry Sherwood / And into Yorkshire he did hie / And the King did follow, with a hoop and a hallow / But could not come him nigh.

I told them, the sherriff could not be admitted on board this time of night, on which they set up a hallow and rowed as fast as they could towards the vessel's bows.

If the sun were a hallow sphere of its present size and the earth were placed at the center[...]. Such a hallow sphere would hold more than a million balls the size of the earth.