Decline is a feature that allows you to reject a new match.
If you receive a new letter from a user but do not wish to continue the conversation, you can use the “Decline” function. It allows you to specify your reason for declining the letter, and does not affect your Sent:Received Ratio.
You can choose a reason from a predefined list or enter your own. Your selected reason will be sent to the sender, and that user cannot send you any further letters.