猫眼

peephole / chrysoberyl

cat / CL:隻|只[zhi1] / (dialect) to hide oneself / (coll.) modem

eye / small hole / crux (of a matter) / CL:隻|只[zhi1],雙|双[shuang1] / classifier for big hollow things (wells, stoves, pots etc)

to have dark circles under one's eyes / to have eyes like a panda

erhua variant of 貓眼|猫眼[mao1 yan3]