The Collaborative International Dictionary
Loggerhead \Log"ger*head`\, n. [Log + head.]
A blockhead; a dunce; a numskull.
--Shak. Milton.A spherical mass of iron, with a long handle, used to heat tar.
(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.(Zo["o]l.) 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.
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(Zo["o]l.) An American shrike ( Lanius Ludovicianus), similar to the butcher bird, but smaller. See Shrike.
To be at loggerheads, To fall to loggerheads, or To go to loggerheads, to quarrel; to be at strife.
--L' Estrange.
Usage examples of "to be at loggerheads".
The CDF and its offspring, the PSS, seemed to be at loggerheads as often as they cooperated with each other.
A fine thing it would be if the people of the clock town were to be at loggerheads every moment with everyone who called them by that name, -or the Cazoleros, Berengeneros, Ballenatos, Jaboneros, or the bearers of all the other names and titles that are always in the mouth of the boys and common people!