駄だ目めを押おす

expression, godan verb (-su)

make sure; make doubly sure; confirm

Used when you want to double-check or confirm something to avoid mistakes. Often implies a final check or a precautionary confirmation.

See also: 駄目押し

• 出しゅっ発ぱつ前まえに、もう一いち度ど鍵かぎをかけたか駄だ目めを押おした。

  Before leaving, I double-checked that I had locked the door.