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

• line scanning
• line-shooter
• line-shooters
• linesman
• linesmen
• lines of battle
• lines of beauty
• lines of country
• lines of credit
• lines of fire
• lines of force
• lines of sight
• lines of vision
• line squall
• line squalls
• line-storm
• line-storms
• line up
• line-up
• line-ups
• liney
• -ling
• ling
• ling.
• linga