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The Collaborative International Dictionary
To be at loggerheads

Loggerhead \Log"ger*head`\, n. [Log + head.]

  1. A blockhead; a dunce; a numskull.
    --Shak. Milton.

  2. A spherical mass of iron, with a long handle, used to heat tar.

  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.

  4. (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.

  5. (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!