to pay some back – to repay a loan or debt
trả nợ, hoàn lại
Example: Nicole paid her friend back the $10 she borrowed.
Note: “Pay pack” also means to “get revenge”. Ex: I know you’re the one who stole my car, and one day I’ll think of a way to pay you back!
Nguồn: Real Life English – Amy Gillet
Bản dịch: Giáo sư Lê Tôn Hiến