slacken

verb ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about slacken at Wordnik → Where our words come from →

1. Become slow or slower.

   Production slowed

2. Make less active or fast.

   He slackened his pace as he got tired

3. Become looser or slack.

   the rope slackened