A wet or surface that will not let your foot — or your hand — get a grip: the moment you press on it, it slides away from you.
From the word’s history
From Old English slipor "slippery", a form built on the same root as slip: the word has always named a surface that lets things slide off it.
一種看法是：這個字從古英語 slipor（滑的）來，和 slip（滑掉、溜走）同源，中間經過中古英語 slipper／slipperie。也就是說，「東西會從上面溜掉」這個畫面從最早就寫在字裡，後來的狡猾、含糊都是把「溜掉」搬到人和意思上。
Wiktionary entry for "slippery" (Old English slipor < Proto-Germanic *slipraz), as supplied in the payload origin note
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原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
slipperyadj/ˈslɪpəɹi/
- 1
Of a surface, having low friction, often due to being covered in a non-viscous liquid, and therefore hard to grip, hard to stand on without falling, etc.
- Oily substances render things slippery.
- The screeching of brakes, the monotonous blare of motor horns, the clip-clip of shoes on slippery pavements, the rustling of wet mackintoshes were all part of the great metropolis.
- 2
Evasive; difficult to pin down.
- a slippery person
- a slippery promise
- 3
obsoleteLiable to slip; not standing firm.
- Which when they fall, as being slippery standers, / The love that leaned on them, as slippery too, / Do one pluck down another, and together / Die in the fall.
- 4
Unstable; changeable; inconstant.
- He looking down With scorn or pity on the slippery state Of kings, will tread upon the neck of fate.
- 5
obsoleteWanton; unchaste; loose in morals.
- My wife is slippery? If thou wilt confess –
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。