Possible Clues:

• Be bold 31. Run-down
• Stick one's neck out
• Show intrepidity
• Truth's alternative
• Say 'You can't do that!' to, say
• Go on, do it for odd-looking dear
• Replacements "I Will ___"
• Be venturesome
• 'I bet you won't go bungee jumping,' e.g.
• Thrown-down gauntlet, e.g.