Related Clues:

• See 49-Across
• See 2-Down
• 'I did it!'
• Start of many limericks
• Pointer's word
• Backrub response
• At that point
• Sound of satisfaction
• Expression of sympathy, when doubled
• On edge
• Physical sound?
• 'What a relief!'
• Cry of accomplishment
• 'Don't stop'
• Sigh of relief