This is the 6886th most frequent Chinese word.
滑
"滑" means "slippery" or "smooth."
Here, '滑' is used as a verb meaning 'to slip'.
他在冰上滑倒了。
He slipped on the ice.
In this case, '滑' is part of the compound noun '滑梯', where it conveys the meaning of 'sliding' as related to a slide.
这个滑梯很好玩。
This slide is very fun.
Here, '滑' is used as an adjective describing the state of being 'slippery'.