dagger n. 短剑；匕首；[印]剑号。
The dagger eyes锋利的眼神，千刀万剐的眼神。 look daggers at sb 对某人怒目而视。
be (at) daggers drawn 势不两立；剑拔弩张。

【例句】
The two sides have been at daggers drawn for some months now with no sign of improvement in relations.
双方一连冷战了好几个月，到现在依然没有任何缓和的迹象。

The teacher looked daggers at the two boys who were passing notes.
老师对两个传字条的男孩子怒目而视。