Wiktionary
phr. (context idiomatic only with bare infinitive English) (non-gloss definition: Indicates something that will happen very soon; indicates that something is imminent.)
Usage examples of "about to".
She didn't believe in lying to children, but she wasn't about to try to explain exactly how she was feeling.
It was enough to keep out "dumb" beasts, but Tremane was not about to take the chance that it would have to stand up to more than that.
Tremane was not about to risk the lives of his men against a mob when a well-made wall would take all the risk out of the situation.
He didn't think about the fraud he was about to perpetrate, or he might have shown some sign that not all was correct.
He had made it very clear at the time that while such inconveniences would pass, he was not about to slow the progress of his walls by restricting the building to the daylight hours.
Well, he was not about to spit on luck and he would capitalize on every piece of luck he got, but he was not going to count on it either.
She left his spirit flayed, and convinced him a dozen times over that she was about to demote him to least-senior cleaner of the Temple latrines-if he was lucky and she was feeling generous.
And they were about to play with forces worse and more hazardous than the one that had done this, weapons that the Mage of Silence, who had created this, thought were too dangerous to use!
He noted that Drizzt had his hands on his scimitars, though they were sheathed (and that meant little for the lightning-fast drow), Bruenor clutched tightly to his axe, Catti-brie to her bow, and Wulfgar, holding Aegis-fang, seemed as if he was about to explode into murderous action.
The admission had Quentin Bodeau spinning about to face the wizard directly.
So now they stared from opposite sides of the thirty-foot diameter room, across the central stairs, each waiting for the other to make the first move, or rather, for the other to show that he was about to move.
To the side of the room cunning Jarlaxle saw it and understood that the fight was about to end.
Drizzt cried, turning about to see the mercenary and his companions, for Jarlaxle had opened the door.
Entreri, on the other side of the room now, turned about to see Drizzt standing ready, blades in hand, to see the vision he so desperately craved.