shiroikaze said: Can anyone explain to me how does "slide" became "suberidai"?
すべり台 is すべり (suberi, "slipping") + 台 (dai, "platform"). My guess is that it's one of those words like 車椅子 that came about while Japan was still pretty protectionist, before the whole "import foreign words into Japanese wholesale using katakana" thing caught on.