1 PHRASAL VERB 放松；（情况）缓和 If a person or situation loosens up, they become more relaxed and less tense. 放松；（情况）缓和
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Relax, smile; loosen up in mind and body and behaviour. [VERB PREP.]
放松，微笑。精神、身体和行为上都要放轻松。
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Young people often loosen up on the dance floor. [VERB PREP.]
年轻人常在舞池中放松自己。
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I think people have loosened up their standards. [VERB PREP. noun]
我认为人们放低了标准。
SYN relax, chill [slang] , soften, unwind
2 PHRASAL VERB-ERG （使）（肌肉）松弛；（使）做准备活动 If you loosen up your body, or if it loosens up, you do simple exercises to get your muscles ready for a difficult physical activity, such as running or playing football. （使）（肌肉）松弛；（使）做准备活动 [Also VERB n PREPOSITION]
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Squeeze the foot with both hands, again to loosen up tight muscles. [VERB PREP. noun]
双手捏脚，目的也是使紧张的肌肉松弛下来。
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Close your eyes. Relax. Let your body loosen up. [VERB PREP.]
闭上眼睛。放松。让身体尽量松弛。