a tall pole on a boat or ship that supports the sails 桅杆；船桅 
a tall metal tower with an aerial that sends and receives radio, television or phone signals 天線塔 people who worry about the health risks of mobile phone masts 擔心手機天線杆健康風險的人們
a tall pole that is used for holding a flag 旗杆 see also half mast
Word OriginOld English mæst, of West Germanic origin; related to Dutch mast and German Mast.
Idioms
nail your colours to the mast
- (especially British English)
to say publicly and clearly what you believe or who you support 公開宣稱；公開表態