Medical Definition of relax
1: to slacken or make less tense or rigid <alternately contracting and relaxing their muscles>
2: to relieve from nervous tension
3: to relieve from constipation <medications to relax the bowels>
1of a muscle or muscle fiber : to return to an inactive or resting state; especially : to become inactive and lengthen
2: to cast off social restraint, nervous tension, or anxiety <couldn't relax in crowds>
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