slacken
1. [ verb ] become slow or slower
Synonyms: slow_down slow slow_up slack
Examples:

"Production slowed"

Related terms: weaken slump
2. [ verb ] make less active or fast
Synonyms: slack_up relax slack
Examples:

"He slackened his pace as he got tired" "Don't relax your efforts now"

Related terms: decrease relaxation
3. [ verb ] become looser or slack
Examples:

"the rope slackened"

Related terms: weaken ease_up
4. [ verb ] make slack as by lessening tension or firmness
Synonyms: remit
Related terms: loosen douse
Similar spelling:   slackening
  slacking
  slackness
  slice_into
  slicing
  slickness