The word "off" has multiple meanings depending on its context.
1) In a general sense, it can be used to indicate that something is not functioning or working properly; for example, "My computer is off right now."
2) It can also be used as an adjective to describe something that is not in operation or not active; for instance, "The lights are off in the room."
3) In some phrases, such as "on the clock" or "off duty," it means not working or not being paid.
4) It can also be used as a preposition to indicate separation or withdrawal from something; for example, "I took my money out of the bank."