1. 减小;(雨等)渐渐停止：let out 放掉(水等),发出 | let up 减小;(雨等)渐渐停止 | on a level with 和...同一水准
2. 减少,减小：11. look up 查找(单词) | 12. let up 减少,减小 | 13. in any case (或 event )无论如何
3. 雨停了：blizzard 大风雪 | 3. let up 雨停了 | clear up 天放晴
4. 停止：let up on 宽容对待 | let up 停止 | let well alone 不要画蛇添足
1. （指持续的令人不快的过程）停止，缓和，减弱
If an unpleasant, continuous process lets up, it stops or becomes less intense.
e.g. The traffic in this city never lets up, even at night...
这个城市道路上的车辆从来就没少过，甚至晚上也不例外。
e.g. The rain had let up.
雨势已经减弱。