Get a new mortgage, slangily

• Lower one's A.P.R., perhaps
• Mortgage maneuver, for short
• Mortgage adjustment, familiarly
• Home buyer's option, in brief
• Int.-lowering option
• Lower-APR loan
• Mortgage modification, briefly
• Interest-lowering option, briefly
• Home loan adjustment, briefly

Wiktionary Word definitions in Wiktionary
n. (context finance English) (abbreviation of refinancing English)