MAY 6, 2008 | To be off
To be off also means "to not be working". EXAMPLES: "I'm off today" (I'm not working today), "I'm off until Thursday" (I'm not working until Thursday).
To be off also has a third meaning - "to not be quite right". EXAMPLES: "Your estimate is a little off" (Your estimate is not quite right/correct), "I tried to guess her age, but I was off by three years" (I was wrong by 3 years), "The soup is a little off" (The soup doesn't taste as good as it normally does/should).
To be off dancing, playing tennis, etc. is just another way of saying "To be out dancing, playing tennis, etc." As you can see, this is a very versatile expression - one that's often used in English.
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