気きを緩ゆるめる

expression, ichidan verb

relax one's efforts; let one's guard down; let up

Used when someone becomes less attentive, careful, or tense, often leading to a mistake or vulnerability. Common in warnings not to let one's guard down.

• 試し験けんが終おわったからといって、気きを緩ゆるめてはいけない。

  Just because the exam is over, you mustn't let your guard down.

• 彼かれはちょっと気きを緩ゆるめた隙すきにミスをした。

  He made a mistake when he let his concentration slip for a moment.