Synonyms and related words :
abate, bate, bend, disentangle, ease, ease off, ease up, extend, flatten, give, give way, let down, let up, let up on, loose, loosen, loosen up, mitigate, put straight, rectify, relax, relent, remit, set straight, sit up, slack, slack off, slack up, slacken, slake, slow down, smooth, stand up, straighten, straighten out, straighten up, submit, unbrace, uncurl, unkink, unlax, unsnarl, unstrain, unstring, unwind, yield