Related Clues:

• Do a slow burn
• Burn slowly
• Burn without a flame
• Suppress hostility
• Not quite catch fire
• Smoke a little
• Barely contain one's anger
• Burn sluggishly
• Burn without flames
• Exist in a state of suppressed anger
• Burn inwardly
• Barely contain anger
• Burn with no flame
• Burn sans flames