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

• come off second best
• come off worst
• come on
• come-on
• come-ons
• come on stream
• come on strong
• come on the scene
• come on to
• come out
• come out in the wash
• come out of one's shell
• come out of the closet
• come out smelling of roses
• come out with
• come over
• come-o'-will
• comer
• come rain or shine
• come round
• comers
• comes
• come short
• come short of
• come someone's way