[about to]
1. Close to; ready to. — Used with an infinitive.
* /We were about to leave when the snow began./* /I haven't gone yet, but I'm about to./
Compare: GOING TO, ON THE POINT OF.
2. {informal} Having a wish or plan to. — Used with an infinitive in negative sentences.
* /Freddy wasn't about to give me any of his ice-cream cone./* /"Will she come with us?" asked Bill. "She's not about to," answered Mary./