Possible Clues:

• What ':' means on some exams
• 'That's all there -- it'
• Colon's meaning, at times
• 'Who __ blame?'
• Finch debut "What It ___ Burn"
• What a colon may symbolize
• 'No one __ blame'
• What ':' stands for in an analogy
• What ":" can mean
• :, on a test