手てが滑すべる

expression, godan verb (-ru)

have one's hand slip; drop something accidentally

Used when something slips from one's hand unintentionally, often due to a momentary loss of grip.

• 手てが滑すべって、コップを落おとしてしまった。

  My hand slipped and I dropped the glass.

• 手てが滑すべらないように、しっかり持もってください。

  Hold it firmly so your hand doesn't slip.