"slacking" in the noun sense
1. shirking, slacking, soldiering, goofing off, goldbricking
the evasion of work or duty
"slacking" in the verb sense
1. slack
avoid responsibilities and work, be idle
2. slack
be inattentive to, or neglect
"He slacks his attention"
3. slack
release tension on
"slack the rope"
4. slack, slacken, slack up, relax
make less active or fast
"He slackened his pace as he got tired"
"Don't relax your efforts now"
5. slow, slow down, slow up, slack, slacken
become slow or slower
"Production slowed"
6. slake, abate, slack
make less active or intense
7. abate, let up, slack off, slack, die away
become less in amount or intensity
"The storm abated"
"The rain let up after a few hours"
8. slack, slake
cause to heat and crumble by treatment with water
"slack lime"
Source: WordNet® (An amazing lexical database of English)
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