Etymology

blow water

Today it means: to brag; to boast; to talk big Full definition →

Cantonese 吹水
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The story

  1. Cantonese · calque of吹水
  2. English todayblow water

Calque of Cantonese 吹水 (ceoi¹ seoi², literally “blow water”).

Etymology from Wiktionary, CC BY-SA 4.0.