slacked

例句:

• The train slacked up as it came into the station.
  列车进站时减了速.
  
• His pace has gradually slacked.
  他的步速逐渐慢了下来.
  
• Haas slacked off in his work.
  哈斯工作很懈怠.
  
• It will be difficult to keep that motivation when my standard has slacked off and I am losing to players I feel I should beat.
  来自BBC