Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An anglicised spelling of do. A syllable used in solfège to represent the first and eighth tonic of a major scale.
  • interj. Expresses surprise and consternation at a stupid mistake made by oneself, or another person.

from the GNU version of the Collaborative International Dictionary of English

  • n. the syllable naming the first (tonic) note of any major diatonic scale in solmization, usually written do.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the syllable naming the first (tonic) note of any major scale in solmization

Etymologies

Popularized by the character Homer Simpson in the TV show the Simpsons (there spelled d'oh). The OED has references from the BBC as far back as 1945, however. (Wiktionary)
An anglicised spelling of do. (Wiktionary)

Examples

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