an amount of money that you give to a landlord before you rent a house or apartment, and that is returned to you after you leave if you have not damaged the property 〔租房子时交给房东的〕保证金
Examples from the Corpus
security deposit• And there usually is a set-up fee and security deposit, plus liability insurance.• You would be required to put down a new security deposit with the new lease drawn up in your name only.