萬國旗 [万国－]

Jyutping maan6 gwok3 kei4
Pinyin wàn guó qí

Definitions (粵典–words.hk)
  1. 名詞、舊式
    好多​支​唔​同​嘅​國​旗
    thousands of country flags
  2. 名詞、舊式
    以前​喺​公屋​、​徙​置區​等等​嘅​地方​，​居民​會將​啲​洗完​嘅​衫​晾​喺​屋​出面​，​因為​家家户户​都​係​咁​，​喺​棟​樓​嘅​出面​睇​，​就​好似​掛住​好多​支旗​噉​，​所以​叫​萬國旗
    figuratively, wet laundries hung outside a building
Definitions (Wiktionary)
  1. noun
    flag of all nations
  2. noun, figuratively
    a row of laundry on a clothesline (usually of different kinds and colors)