閂定度門 [闩－－门]

Jyutping saan1 ding6 dou6 mun4
Pinyin shuān dìng dù mén

Definitions (粵典–words.hk)
  1. 語句
    喺​人​哋​未​表明​來意​之前​就​拒絕​咗​先
    to reject before the request is stated clearly
  2. 近義詞
    落閘