Longman Dictionary of Contemporary English homepage

slacken

verb
     
slack‧en [intransitive and transitive] written
1 also slacken off to gradually become slower, weaker, less active etc, or to make something do this:
The heavy rain showed no signs of slackening off.
slacken your pace/speed (=go or walk more slowly)
Guy slackened his pace as he approached the gate.
2 to make something looser, or to become looser [≠ tighten]:
He did not let her go, but his grip on her slackened.

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