1. Avoiding or neglecting a duty or responsibility
   "The manager caught them slacking off during work hours";
   - shirking, goofing off [N. Amer, informal], goldbricking [N. Amer, informal]

1. Make less active or intense
   "The cool breeze slacked the oppressive humidity";
   - slake, abate
    
2. Become less in amount or intensity
   "The storm slacked off";
   - abate, let up, slack off [informal], die away
    
3. Make less active or fast
   "The runners slacked up their pace in the final mile";
   - slacken, slack up, relax
    
4. Become slow or slower
   "Business slacked during the summer months";
   - slow, slow down, slow up, slacken
    
5. Avoid responsibilities and work, be idle
   "He was caught slacking off during his shift"
    
6. Be inattentive to, or neglect
   "He slacks his attention"
    
7. Release tension on
   "slack the rope"
    
8. Cause to heat and crumble by treatment with water
   "slack lime";
   - slake

Type of: come down, decrease, dent, diminish, dodging, escape, evasion, fall, fiddle, go down, goldbrick [N. Amer, informal], hydrate, lessen, loose, loosen, minify, neglect, shirk, sink, weaken

Encyclopedia: Slacking