We found 1 definitions of slack up from 1 different sources.
Verb |
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slack up - make less active or fast; "He slackened his pace as he got tired"; "Don't relax your efforts now" | ||
slack, slacken, relax | ||
minify, decrease, lessen decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper" |