I'm off

You usually say it as you grab your keys or bag. It is almost always used in the present tense. You can use it alone or add your destination. For example, I'm off to work or I'm off to bed. It is short, punchy, and very natural for daily life.

Use this when you want a smooth exit. It works perfectly at the end of a coffee date. Use it when you are the first person to leave a party. It is great for the office when you finish your shift. It sounds confident and clear. Even a quick text to a roommate works: I'm off now, see you later!

Avoid this in very solemn or sad situations. Do not say it during a funeral or a serious breakup. It might sound too casual or dismissive there. Also, do not use it in a formal speech to a large audience. In a legal court or a high-stakes board meeting, stick to I must depart or I am leaving.

British and Australian speakers use this constantly. Americans use it too, though they might prefer I'm heading out. It comes from the idea of a horse starting a race—the announcer shouts They're off! It suggests a clean, quick start to a journey. It reflects a culture that values efficiency and informal social cues.

You will often hear I'm off then which adds a sense of finality. Another one is Right, I'm off, where Right acts as a signal that the conversation is over. If you are leaving in a hurry, you might say I'm off like a dirty shirt, though that is a bit old-fashioned and funny!