- 1. lose efficacy; lose effectiveness; cease to be effective
- ♦ 这药已~了。 The medicine no longer has any effect.
- ♦ 使水雷~ deactivate mines
- 2. (of a treaty, an agreement, etc.) be no longer in force; become invalid
- ♦ 自动~ automatically cease to be in force
- ♦ 条约的~ voidance (or voidness) of a treaty