(Science: zoology) dagger moth, any moth of the genus Apatalea. The larvae are often destructive to the foliage of fruit trees, etc. Dagger of lath, the wooden weapon given to the vice in the old Moralities. Double dagger, a mark of reference [<ddagger/] which comes next in order after the dagger. To look, or speak, daggers, to look or speak fiercely or reproachfully.