fall back (v.)

• avoid
• back
• backslide
• blench
• blink
• cringe
• degenerate
• deteriorate
• disengage
• dodge
• duck
• evade
• fade
• fall
• flinch
• follow
• jib
• lapse
• quail
• recidivate
• recoil
• regress
• relapse
• retire
• retract
• retreat
• retrograde
• retrogress
• revert
• shrink
• shy
• sicken
• sidestep
• slacken
• swerve
• trail
• wince
• withdraw
• worsen