It may precede a blessing

• Allergic reaction of a sort
• Sound of a sneeze
• Cold blast?
• Response to a sudden chill
• Cause for a blessing, maybe
• Sound we make when we explode
• Sound before “Gesundheit!”
• Sound from a 45-Across
• Cold burst?

Wiktionary Word definitions in Wiktionary
interj. (context onomatopoeia English) The sound of a sneeze. n. The sound of a sneeze.