on needles and pins

基本解释

He's on pins and needles.
他坐立不安的。
This job interview has had me on needles and pins all day.
这次面试使我整天都坐立不安。
He tried to look calm and confident but everybody in the courtroom knew he was on pins and needles.
他想装得很平静，很有自信，但是在法庭上的每个人都知道他很紧张。

And so there's a sense of being on pins and needles among Republicans.
NPR: Foley, Iraq Cause Headaches for GOP
We've been waiting on pins and needles for Google to announce some official Android tablet plans for so long we'd almost forgotten about Mountain View's other operating system -- but from what we're hearing, Chrome OS is about to jump to center stage with a tablet debut on Verizon just before the holidays.
ENGADGET: Chrome OS tablet coming from Google and Verizon on Black Friday? (update: probably not)