Pins and needles are small, sharp, thin metal objects often used when sewing.

大头针和缝纫针，是细小、尖尖的的金属物，在缝纫中经常会用到。

worried or excited about something that is going to happen

为即将发生的事情而担心(或激动)，如坐针毡

Don’t keep Margaret on pins and needles – give her a call.

别让玛格丽特担心了，给她打个电话。

He was on pins and needles in wanting to know whether his daughter had been saved or not.

他坐立不安，急于要知道他的女儿是否脱险。