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Houghton Mifflin

slack·en  audio  (slkn) KEY 

tr. & intr.v.
slack·ened, slack·en·ing, slack·ens
  1. To make or become slower; slow down: The runners slackened their pace. Air speed slackened.
  2. To make or become less tense, taut, or firm; loosen: I slackened the line to let the fish swim. The tension in the board room finally slackened.
  3. To make or become less vigorous, intense, or severe; ease: slacken discipline; afraid that morale might slacken.

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