loosen up
1
- warm up in preparation for an activity（在竞技或某种其他活动之前）做准备工作; 做热身动作：
arrive early to loosen up and hit some practice shots.
早点来, 活动一下身体, 练习投几次篮。
1.1
- make or become relaxed（使）放松：
they taught me to have fun at work and loosen up
他们教我上班时开心点儿, 要学会放松点儿
1.2
loosen someone up
使某人放松：the beer is loosening him up.
啤酒慢慢让他放松下来。