To make holy or sacred; to consecrate or treat with reverence.
From en- (prefix) + hallow (from Old English halig, meaning 'holy'). It's an archaic or poetic way to say 'make holy' or 'sanctify.'
While we might say 'hallow' (as in 'Halloween' meaning 'holy evening'), 'enhallow' adds the intensifying prefix en-, making it sound like an older, more reverent way to describe making something sacred.
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