Possible Clues:

• "... ___ quit!" (ultimatum ending)
• 'Either she goes -- go!'
• 'Either he goes -- go'
• Mouth: Prefix
• '... -- quit!' (ultimatum)
• "... --- quit!"
• '... ___ will!'
• “Horatio, ___ do forget myself”: Hamlet
• 'It must be him, ___ shall die'
• "... — quit!" (threat ender)