security deposit
noun🔊/sɪˈkjʊərəti dɪpɒzɪt/
🔊/sɪˈkjʊrəti dɪpɑːzɪt/
[usually singular] (especially North American English)a sum of money you pay when you rent a place to live and that is returned when you leave if you do not cause any damage The landlord requires a security deposit of one month's rent. 房东需要缴纳一个月租金的保证金。