Cách sử dụng
The expression "hard and fast" is used when describing rules, guidelines, or principles that are strict and inflexible. It means that the rules cannot be changed or altered no matter what the circumstances are. For example, "The company has a hard and fast rule that employees are not allowed to use their personal phones during work hours." In this context, the rule is very strict and cannot be broken under any circumstances. It can also be used to describe a decision or agreement that must be adhered to strictly, like "We have a hard and fast deadline for the project, so we need to complete it by Friday." This means the deadline cannot be extended and has to be met no matter what happens.