If you are in arrears, you are behind in the payment of a debt. Think: rears=behind. Arrears also refers to the unpaid, overdue debt itself. Your rent arrears are the money you own on rent.

Arrears is a term often used in a legal context––like, when you've had to hire a lawyer because you're being sued by your landlord, or being evicted because you're in arrears on your rent. Before it comes to eviction, though, you should try negotiating with your landlord first. They would probably be more interested in collecting arrears, even late, than in evicting you and starting with a new tenant from scratch.

Definitions of arrears
  1. noun
    the state of being behind in payments
    “an account in arrears
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    type of:
    financial obligation, indebtedness, liability
    an obligation to pay money to another party
  2. noun
    an unpaid overdue debt
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    type of:
    money or goods or services owed by one person to another
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