noun
surprise attack; sneak attack; foul play
An attack made by deceiving the opponent, often implying a breach of trust or unfair tactics. Used in both literal combat and figurative contexts like sports or business.
敵はだまし討ちを仕掛けてきた。
The enemy launched a sneak attack.
彼のやり方はだまし討ちも同然だ。
His method is practically foul play.
Compound of だまし (continuative form of だます, 'to deceive') and 討ち (continuative form of 討つ, 'to attack').