Out to lunch

adj, slang

Definitions

Adjective
  1. 1
    Away eating lunch or for a midday break; especially, away from work or a job. not-comparable

    "She's out to lunch right now, but you may leave her a note."

  2. 2
    Clueless, inattentive, or careless. idiomatic, informal, not-comparable

    "After he drove with his turn signal on for five miles, I was pretty sure he was out to lunch."

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