A security deposit paid to a landlord when renting; typically refundable (in whole or part) on move-out depending on contract terms and repair costs.
新しいアパートを借りるとき、敷金として家賃の一か月分を払った。
When renting a new apartment, I paid one month's rent as a deposit.
退去時に敷金は修繕費に充てられることがある。
Upon moving out, the deposit may be applied to repair costs.
最近は敷金なしの物件も増えている。
Recently, properties with no deposit have been increasing.