Synonyms and related words :
abate, arrest, backpedal, backwater, bate, brake, check, clip the wings, curb, decelerate, delay, detain, draw rein, ease, ease off, hold back, hold in check, hold up, impede, keep back, let down, let up, let up on, loose, loosen, lose ground, lose momentum, lose speed, mitigate, moderate, obstruct, reef, rein in, relax, remit, retard, set back, slack, slack off, slack up, slacken, slake, slow, slow down, slow up, stay, take in sail, throttle down, unbend, unbrace, unlax, unstrain, unstring, unwind,