飞针走线

flying needle and running seam (idiom); skillful needlework

to fly

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

variant of 針|针[zhen1], needle

to walk / to go / to run / to move (of vehicle) / to visit / to leave / to go away / to die (euph.) / from / through / away (in compound verbs, such as 撤走[che4 zou3]) / to change (shape, form, meaning)

variant of 線|线[xian4]

thread / string / wire / line / CL:條|条[tiao2],股[gu3],根[gen1] / (after a number) tier (unofficial ranking of a Chinese city)