/bæk/ – adv
Definition: 1. ký hậu, ký vào mặt sau của chứng từ;
2. thị thực, chứng nhận;
3. hậu thuẫn, củng cố thêm bằng những chứng cứ.
A more thorough explanation: In legal terms, the word “back” typically refers to the rear part of something, such as the back of a document or the back of a property. It can also refer to support or endorsement, as in backing a claim or supporting a position.
Example: The defendant was ordered to pay back the money he had unlawfully obtained from the plaintiff.