on pins and needles

基本解释

Mrs. Watson sat on pins and needles.
沃森太太如坐针毡。
The colonel, on pins and needles, did what he could to speed up the departure of the countryside guests.
如坐针毡的上校尽快打发走了乡下的来宾。
He's on pins and needles.
他坐立不安的。

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)