کلماتور
The European sand ray (Raia maculata); -- called also home, mirror ray, and rough ray.
To fail, as on a lesson; to back out, as from an undertaking, through fear. To fail in; to shirk, as a task or duty. [Colloq. U.S.] A failure or backing out; specifically (College cant), a total failure in a recitation. [U.S.]