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slacken (verb) reduce speed, effort, etc.
When you slacken your effort, you reduce your effort. When you slacken your speed, you reduce your speed. When you slacken, you become less energetic than you were before.
- He slackened his efforts to achieve it, because of his earlier two failures. He is making less effort now as he fears he may fail again.
- The government has slackened its control over the business companies. It is now not so strict because it fears that too much of control may affect business activity.