slack up

Từ điển WordNet v3.1 - WordNet Dictionary

verb

make less active or fast
- He slackened his pace as he got tired
- Don't relax your efforts now
• Syn:
slack, slacken, relax
• Derivationally related forms:
relaxation (for: relax), slack (for: slack)
• Hypernyms:
decrease, lessen, minify
• Verb Frames:
- Somebody ----s something
- Something ----s something