Cách sử dụng
The word 'ironclad' means something is very strong, secure, and cannot be easily broken or changed. It is often used to describe a contract, agreement, or promise that is very firm and cannot be broken. For example, "We have an ironclad contract that guarantees our salary for the next two years." It can also be used to describe a physical object that is heavily armored, such as an ironclad battleship from the 19th century.