The phrase "rate guarantee" means that a certain price or rate is promised to remain the same, and will not change or increase for a specific period of time. Full definition
They would actually give you the first night of your stay for free if you made a successful best rate guarantee claim. (viewfromthewing.boardingarea.com)
The initial interest rate credited to the 3 — and 5 — year extended guaranteed periods will be lower than that credited to a contract with a 1 - year interest rate guaranteed period. (jackson.com)
Only available at participating locations that advertise the Low Rate Guarantee. (americantitleloans.com)