Closing lines in sales are the last words a salesperson says right before they close a deal. The reason closing lines are so important is because they make an impact on the customer's emotions. These lines should be relevant to the customer and trustworthy, but most importantly, they should capture their attention until the deal is closed.

1 (of soldiers or police officers) come closer together in a line. 2 unite in order to defend common interests. 2 1998 Country Life The farming community stands to lose those privileges unless it closes ranks against the few who let the side down.