›FINANCEto make people agree to particular conditions when they borrow, invest, or buy a product, especially relating to the minimum period of time the agreement can last: tie sb inWatch out for bonus accounts that tie you in after the bonus period.tie sb in with sthFixed-rate mortgages usually tie borrowers in with early repayment charges.tie sb in for sthYou need to know your mortgage rate and how long you are tied in for.