CÚ 'dog, hound' is often found as a personal name; well-known examples include Cú Chulainn and Cú Roí. An unidentified individual, called simply Cú, turns up in the saying 'doringnis Cú ┐ Cethen dím' (You have made me into Cú and Cethen). According to the explanation found in the Book of Leinster, this Cú killed Cethen, a server in the house of Cormac mac Airt, and was himself killed immediately. It may be, then, that the saying means roughly 'you have placed me in a situation where there is no good outcome'.
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