look out for number one

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look out for number one¹

Where it comes from

From look out for + number one (“oneself”). Attested since the 1830s at the latest.

verb looks out for number one · looking out for number one · looked out for number one · look for number one · look out for Number One

  1. idiomatic To act in one's own interests; to act in a manner advantageous primarily to oneself. S.—Ah—get out. Look out for number one—that's my doctrine; and let others do the same;—and if they don't, why, the flats must be contented with being gulled—that's all. It is n't my look-out, if a man does n't know enough, or does n't think enough, or is n't careful enough: if I can shave him a litt

look out for Number One²

verb looks out for Number One · looking out for Number One · looked out for Number One

  1. alternative Alternative form of look out for number one

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MLA

"look out for number one." Wiktionary, via Micwyn, micwyn.com/word/look%20out%20for%20number%20one. Accessed 7 Nov. 2026.

APA

look out for number one. (n.d.). In Wiktionary, via Micwyn. Retrieved November 7, 2026, from https://micwyn.com/word/look%20out%20for%20number%20one

Chicago

"look out for number one." Wiktionary, via Micwyn. Accessed November 7, 2026. https://micwyn.com/word/look%20out%20for%20number%20one.

BibTeX
@misc{look_out_for_number_one_2026,
  title = {look out for number one},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/look%20out%20for%20number%20one},
  urldate = {2026-11-07}
}