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riser

noun
🔊/ˈraɪzə(r)/
🔊/ˈraɪzər/
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  1. early/late riser a person who usually gets out of bed early/late in the morning（习惯于早或晚）起床的人
  2. (specialist) the part that goes up between two steps in a set of stairs 立板（楼梯踏步板的竖直部分）compare tread