Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb idiomatic, intransitive To leave (a place) hastily (originally military).
  • verb idiomatic, intransitive to abandon someone without warning.
  • verb idiomatic, intransitive miss school, play truant, play hooky.
  • verb idiomatic, transitive, of one's eyes To cause to bulge
  • verb idiomatic, computing To crash or glitch
  • noun military A rapid retreat, a rout.

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

  • verb bulge outward

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Attested 1950, popularized in the Korean War (1950–53) in such phrases as “bug-out fever” (rout) and “the big bug out” (November/December 1950 retreat) and entered civilian slang by mid 1950s. Likely originated in World War II, perhaps based on 1930s cartoons featuring bugs fleeing an impending foot or boot. Ultimately based on the rapid, disorderly flight of bugs when discovered, particularly their scattering if several are discovered at once, such as under a rock or can. Compare chicken out.

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