如坐针毡

lit. as if sitting on pins and needles (idiom) / fig. to be in an uncomfortable situation

as / as if / such as

to sit / to take a seat / to take (a bus, airplane etc) / to bear fruit / variant of 座[zuo4]

needle / pin / injection / stitch / CL:根[gen1],支[zhi1]

variant of 針|针[zhen1], needle

needle felting (craft) / piece of felt used as a pincushion

felt (fabric)

variant of 氈|毡[zhan1]