Similar word to untighten:

abate, aid, allay, ameliorate, anesthetize, appease, assist, assuage, attend to, calm, cheer, clear the way, comfort, cure, disburden, disengage, doctor, expedite, facilitate, forward, free, further, improve, lessen, let up, let up on, lift, lighten, loose, loosen, make easier, meliorate, mitigate, moderate, mollify, nurse, open the door, pacify, palliate, promote, quiet, relax, release, relent, relieve, run interference for, simplify, slack, slacken, smooth, soften, soothe, speed, speed up, still, tranquilize


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