Translation

徐々に生じる / 積み上がる / 発生する

Meaning

Accrue means to gradually build up or be gained over time, especially interest, benefits, costs, or legal rights. It sounds formal and is often used when the increase happens automatically.

Examples

• その口座では毎月利息が発生します。
  Interest accrues on the account every month.
• 未払いの請求には延滞料金が徐々に加算されます。
  Late fees accrue on unpaid bills.