Possible Clues:

• Pressure on witticism lifting union agreement?
• People recently engaged now use precautions, primarily this?
• Engagement agreement, for short
• Dress up, as you might say -- a requirement before the wedding?
• Shortened term for a contract entered into prior to marriage or civil union
• Agreement made before marriage
• Rent reduced in youngster's contract prior to match
• Contract before marriage, informally
• Post-engagement agreement
• Agreement in relationship where Greek character bedded by groom