見縫插針

lit. to see a gap and stick in a needle (idiom); fig. to make use of every second and every inch

to insert / stick in / pierce / to take part in / to interfere / to interpose

old variant of 插[cha1]

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

to see / to meet / to appear (to be sth) / to interview / opinion / view

to appear / also written 現|现[xian4]

to sew / to stitch

seam / crack / narrow slit / CL:道[dao4]