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Remember how 滑る is "to slide," and 台 is a counter for machines? In this case, the "machine" you slide down is a playground slide, or just a slide for short.
The reading comes from 滑る and 台.
甥っ子の誕生日祝いに滑り台を作ってるんですが、少々予定が遅れ気味なんですよね。
I'm making a slide for my nephew's birthday, but I'm a little behind schedule.
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