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oneself

[wuhn-self, wuhnz-]
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pronoun
  1. a person's self (used for emphasis or reflexively): One often hurts oneself accidentally.
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Idioms
  1. be oneself,
    1. to be in one's normal state of mind or physical condition.
    2. to be unaffected and sincere: One makes more friends by being oneself than by putting on airs.
  2. by oneself,
    1. without a companion; alone.
    2. through one's own efforts; unaided: to become a millionaire by oneself.
  3. come to oneself,
    1. Also come to.to regain consciousness.
    2. to regain one's self-possession; come to one's senses.
    Also come to one's self.
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Also Archaic, one's self.

Origin of oneself

First recorded in 1540–50; shortened form of one's self
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for by oneself

oneself

pronoun
    1. the reflexive form of one (def. 20), one (def. 21)
    2. (intensifier)one doesn't do that oneself
  1. (preceded by a copula) one's normal or usual selfone doesn't feel oneself after such an experience
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for by oneself

oneself

1540s, one's self. Hyphenated 18c.; written as one word from c.1827, on model of himself, itself, etc.

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Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with by oneself

by oneself

Alone, unaccompanied; also, unassisted. For example, She enjoyed being by herself much of the time, or Brian can pick up his toys by himself. [c. a.d. 1000]

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oneself

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.