'slack up' definitions:
verb
Make less active or fast; "He slackened his pace as he got tired"; "Don't relax your efforts now" [syn:
slack,
slacken, slack up,
relax]
Words containing 'slack up'
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Slack,
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Slacked,
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Slacking,
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Slackly,
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Slackness,
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slack off,
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slacks,
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Slack hand,
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Slack in stays,
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Slack water,
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slack suit,
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slack tide,
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Air-slacked lime,
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Slack-water navigation,
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esther hobart mcquigg slack morris