pull it off

John GrishamのThe Brethrenを読んでいます。刑務所には持ち込めないはずの携帯電話をArgrowは持っていました。
"I have a brother in Boca Raton. The phone and the service were gifts from him." He snapped it back smartly, and it vanished before their eyes. Then he pointed to the small conference room behind them, to their chamber. "What's in there?" he asked.
"Just a conference room," Spicer said.
"It has no windows, right?"
"None, except for that small one in the door."
"All right. What if I go in there, get on the phone, and go to work.You three stay here and watch out for me. If anyone enters the library, come knock on the door."
The Brethren readily agreed, though they did not believe Argrow could pull it off.
最後に出てきた慣用句らしき表現 "pull it off" の意味を辞書で調べます。
・McGraw-Hill Dictionary of American Idioms and Phrasal Verbs: to manage to make something happen. Yes, I can pull it off. Do you think you can pull off this deal?
・Cambridge Dictionary of American Idioms: to succeed in doing something difficult or unexpected He won five straight games and pulled off one of the tournament's biggest upsets. I don't know how you pulled it off, but we're now $5,000 richer than we were yesterday.
英語は単語も多いし、この手の慣用句も沢山あって厄介です。