If you are ~ by something, you are very surprised about it.
They were ~ to find the driver was a six-year-old boy.
ADJ: oft ADJ by/at n, ADJ to-inf, ADJ that
If you are ~ by something, you are very surprised about it.
They were ~ to find the driver was a six-year-old boy.
ADJ: oft ADJ by/at n, ADJ to-inf, ADJ that
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012