at loggerheads

Uncertain; possibly from the use of a loggerhead (“metal tool consisting of a long rod with a bulbous end”) as a weapon during a fight.[1]

• (Received Pronunciation) IPA^(key): /æt ˈlɒɡəhɛdz/
• (General American) IPA^(key): /æt ˈlɔɡɚˌhɛdz/, /ˈlɑ-/

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• Hyphenation: at log‧ger‧heads

at loggerheads

1. (figuratively) Unable to agree; opposing.

   We were really at loggerheads about what to do with the money we found on the side of the road; she said we should turn it in, I said we should keep it.

• at odds
• at sixes and sevens