动词短语
中文翻译：松懈
同义词：
['lose the steam', 'slow down']
例句：
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1.After a long day at work, I need to slack up and take a break.
工作了一整天后，我需要放松一下，休息一会儿。
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2.The team needs to slack up if they want to finish the project on time.
如果团队想要按时完成这个项目，他们需要放慢速度。
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3.As the race neared its end, the runners had to slack up and conserve their energy.
随着比赛接近尾声，运动员们不得不放慢速度，节省体力。