気(き)を緩(ゆる)める

気(き)を緩(ゆる)める事(こと)は失敗(しっぱい)に繋(つな)がります。

Relaxing one's attention can lead to failure. {to relax one's attention}

監督(かんとく)：「まだ一(いっ)点(てん)取(と)っただけだ！気(き)を緩(ゆる)めるな！」

Director: "We've only scored one point! Don't relax your attention!" {to relax one's attention}

任務(にんむ)中(ちゅう)に気(き)を緩(ゆる)めてしまったせいでミスを犯(おか)してしまった。

I made a mistake because I relaxed my attention during the mission. {to relax one's attention}

接客(せっきゃく)中(ちゅう)に気(き)を緩(ゆる)めた、ときたら客(きゃく)からクレームが入(はい)るのも当然(とうぜん)である。

It's only natural to receive complaints from customers if you let your guard down while serving. {to relax one's attention}

訓練(くんれん)中(ちゅう)に気(き)を緩(ゆる)めているような兵士(へいし)は戦地(せんち)ですぐに敵(てき)に殺(ころ)されてしまうでしょう。

A soldier who seems to relax his attention during training will probably be killed by the enemy on the battlefield immediately. {to relax one's attention}