'To go to loggerheads' definitions:

Definition of 'To go to loggerheads'

From: GCIDE

Loggerhead \Log"ger*head`\, n. [Log + head.]
1. A blockhead; a dunce; a numskull. --Shak. Milton. [1913 Webster]
2. A spherical mass of iron, with a long handle, used to heat tar. [1913 Webster]
3. (Naut.) An upright piece of round timber, in a whaleboat, over which a turn of the line is taken when it is running out too fast. --Ham. Nav. Encyc. [1913 Webster]
4. (Zool.) A very large marine turtle ({Thalassochelys caretta} syn. Thalassochelys caouana), common in the warmer parts of the Atlantic Ocean, from Brazil to Cape Cod; -- called also logger-headed turtle. [1913 Webster]
5. (Zool.) An American shrike (Lanius Ludovicianus), similar to the butcher bird, but smaller. See Shrike. [1913 Webster]
To be at loggerheads, To fall to loggerheads, or {To go to loggerheads}, to quarrel; to be at strife. --L' Estrange. [1913 Webster]