slackener
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slackener — slack·en·er … English syllables
slacken — [slak′ən] vi. [< SLACK1] 1. to become less active, intense, brisk, etc. [slackening trade] 2. to become less tense; loosen, as rope vt. 1. to reduce the intensity or severity of; retard; abate; moderate 2. to reduce the tension of; relax; loos … English World dictionary
