be off meaning

Interjection: be off

1. Instruction to go away
   - avaunt [archaic], beat it, begone, bog off [Brit], get lost, go away, hop it [Brit], leg it, scram, get knotted [Brit], run along, sod off [Brit], take a hike

[American idiom]
to leave; to depart.
• Well, I must be off. Good-bye.
• The train leaves in an hour, so I must be off.

[American slang]
v. phr. 1. v. To be in error; miscalculate. The estimator was off by at least 35% on the value of the house. 2. v. To leave. Jack ate his supper in a hurry and was off without saying goodbye. 3. adj. Cancelled; terminated. The weather was so bad that we were told that the trip was off. 4. adj. Crazy. I'm sure Aunt Mathilda is a bit off; no one in her right mind would say such things. 5. adj. Free from work; having vacation time. Although we were off for the rest of the day, we couldn't go to the beach because it started to rain.

Examples

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1. i must be off now to see after him.
2. in a week i must be off again.
3. the day after tomorrow is sunday, but i'll be off duty.
4. now be off with you, and don't come bothering me any more.
5. you must be off your rocker!