绿头巾

green turban (figuratively, a symbol of being a cuckold)

green / (slang) (derived from 綠帽子|绿帽子[lü4 mao4 zi5]) to cheat on (one's spouse or boyfriend or girlfriend)

head / hair style / the top / end / beginning or end / a stub / remnant / chief / boss / side / aspect / first / leading / classifier for pigs or livestock / CL:個|个[ge4]

suffix for nouns

cloth head covering worn by men in ancient times / headscarf (typically worn by women) / kerchief / turban

towel / general purpose cloth / women's headcovering (old) / Kangxi radical 50

see 戴綠帽子|戴绿帽子[dai4 lü4 mao4 zi5]