Possible Clues:

• “That’s ___!” (angry denial)
• 'It's a Sin to Tell ___' (1936 hit)
• Sam Shepard's '-- of the Mind'
• 'That's ___!' (angry retort)
• "I cannot tell ___" (George Washington)
• '...tell ___'
• Live ___ (be someone you're not)
• "It's a sin to tell ---"
• 'That is ___!'
• 'That's ___!' (debate retort)