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relax 
1 abate, diminish, ease, ebb, lessen, let up, loosen, lower, mitigate, moderate, reduce, relieve, slacken, weaken 
2 be  or  feel at ease, calm, chill out  (slang, chiefly U.S.) hang loose  (slang) laze, let oneself go  (informal) let one's hair down  (informal) lighten up  (slang) loosen up, make oneself at home, mellow out  (informal) put one's feet up, rest, soften, take it easy, take one's ease, tranquillize, unbend, unwind 
 
Antonyms  
 
1 heighten, increase, intensify, tense, tighten, work 
2 alarm, alert