[1] : WordNet (r) 2.0

ease up
     v 1: move in order to make room for someone for something; "the
          park gave way to a supermarket"; "`move over,' he told
          the crowd" syn: move over, give way, give, yield
     2: become less intense syn: ease off, slacken off, flag
     3: reduce pressure or intensity; "he eased off the gas pedal
        and the car slowed down" syn: ease off, let up
see also:
move over give way give yield ease off slacken off 
flag let up 

[2] : Moby Thesaurus II by Grady Ward, 1.0

54 moby thesaurus words for "ease up":
   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

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

At Ease >> A Words
At Ease, definition of term: At Ease
at+ease_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html