洗衫板 [－－－]

Jyutping sai2 saam1 baan2
Pinyin xǐ shān bǎn

Definitions (CC-CANTO)
  1. scrubbing board for washing the clothes; an expression to describe a flat-chested woman
Definitions (粵典–words.hk)
  1. 名詞
    用​嚟​洗​衫​嘅​板​狀​工具​；​多數會​有​呈​鋸齒​狀​凹凸​相​間​嘅​坑​漕​，​用法​係​將​衣服​濕水後來​回​搓​，​利用​壓力​、​摩擦​就​可以​整​甩​啲​污垢​（​量​詞​：​塊​）
    washboard, a tool for washing clothes
  2. 名詞
    對​平胸​女性​嘅​謔​稱
    mockery address to flat-chested females
  3. 近義詞
    洗衣板
Definitions (Wiktionary)
  1. noun, Cantonese, Hainanese, Hakka, Leizhou-Min, Teochew
    washboard
  2. noun, Cantonese
    flat-chested woman
    (syn.) 洗衣板, 搓板
Definitions (Kaifangcidian)
  1. 搓板