Related Clues:

• Cause agitation
• Bring to a boil
• Enrage
• Stir up trouble
• Get under one's skin
• Muddy the water
• Really irk
• Ruffle some feathers
• Exasperate
• Steam
• Get in a lather
• Stir up, without a spoon
• Fire up
• Churn up
• Ruffle one's feathers