slacken
intransitive-verb
UK: /ˈslækən/
US: /ˈslækən/
To become slower or less active.
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Traffic will slacken after 7 PM.
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The pace of work began to slacken as the weekend approached and people looked forward to some time off.
To make something looser or less tight.
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Slacken the rope a bit, please.
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He had to slacken his belt after the large meal because it became quite uncomfortable.