v.偷懒( slack的过去式和过去分词 );减速;放松;
例句:
The train slacked off as it came into the station.
火车进站时将速度减慢了.
The offensive has slacked off.
攻势已经衰弱.
If you slacked consistently, you could be thrown overboard.
如果你屡教不改老偷懒, 你可能会被活活扔到海里.