1.slack; sluggish; remiss 2.to neglect; to relax; to keep a slack hand; to slack off (or up); to slacken是什么意思_1.slack; sluggish; remiss 2.to neglect; to relax; to keep a slack hand; to slack off (or up); to slacken在线翻译_英语_读音_用法_例句