Wearing a green hat (戴绿帽子, dài lǜ màozi) means your partner is cheating on you — never give someone a green hat as a gift in China! This dates back centuries to when certain disgraced men were made to wear green headwear.
usage
The pinyin lǜ uses the ü vowel. On a keyboard, type "lv" for 绿. Many learners confuse the pronunciation with "lu" — the lips should be rounded as if saying "ee" with pursed lips.
