Sweat it out：
Working hard in the gym or during exercise.
“sweat” 的意思是 “流汗”，而包含 “sweat” 的表达 “sweat it out” 的意思是 “做高强度的运动锻炼身体”，这种运动锻炼往往让人 “挥汗如雨”。“Sweat it out” 多用在非正式的口语交流中。
例句
My boyfriend used to hate exercise, but now he really likes to sweat it out in the gym for a few hours a week.
我的男朋友过去很不喜欢运动，但现在他真的很喜欢每周去健身房里做几个小时高强度的运动锻炼。
Thousands of people sweat it out at the London Marathon every year.
每年都有成千上万名参赛者在伦敦马拉松赛上挥汗如雨。
My friend and I tried a new dance class last night – we really sweated it out! It was so hard!
我和我朋友昨晚上了一门新的舞蹈课。我们真是累坏了！舞蹈动作好难！
