Related Clues:

• Chills
• Flu symptoms
• Becomes less friendly
• Flu symptom
• Kicks back
• Sits on a windowsill, say
• Becomes less enthusiastic
• Ague component
• Ague factor
• Puts on ice
• Mellows out
• Calms down
• Loses warmth
• Becomes indifferent
• Rests on a sill, maybe