1. A challenge to defend what someone has said
   - demand for explanation

Type of: challenge

• heat lamp
• heat lightning
• heat of condensation
• heat of dissociation
• heat of formation
• heat of fusion
• heat of solidification
• heat of solution
• heat of sublimation
• heat of transformation
• heat of vaporisation
• heat of vaporization
• heat prostration
• heat pump
• heat rash
• heat ray
• heat shield
• monseigneur
• Monsieur
• Monsignor
• monsoon
• monsoonal
• monster
• monstera
• Monstera deliciosa