quid pro quo /kwid prō kwō/

1. Something given or taken as equivalent to another, often as retaliation or in return for a previous favour
2. The action or fact of giving or receiving thus

• photophones
• photophonic
• photophonies
• photophony
• photophore
• photophores
• photophoreses
• photophoresis
• photopia
• photopias
• photopic
• photopolarimeter
• photopolymer
• photopositive
• not up to much
• Notus
• not very
• notwithstanding
• not worth a damn
• not worth a day's purchase
• not worth shucks
• no two ways about it
• nougat
• nougatine
• nougatines