Cách sử dụng
The expression "punch in" means to enter some information into a computer, usually your personal identification number (PIN), in order to start work or to record your working hours. This is usually done by pressing buttons on a keypad, much like punching someone with your fist. You might hear this expression in a workplace where employees have to clock in and out, or in a system where you have to type in a password to access a website or program.