Definition of by oneself in US English:

by oneself

phrase

  • 1Alone.

    ‘living in that big house by himself’
    alone, all alone, on one's own, in a solitary state, singly, separately, solitarily, unaccompanied, companionless, partnerless, unattended, unescorted, unchaperoned, solo
    View synonyms
  • 2Unaided.

    ‘the patient often learns to undress by himself’
    unaided, unassisted, without help, without assistance, by one's own efforts, under one's own steam, independently, single-handed, single-handedly, solo, on one's own, alone, all alone, off one's own bat, on one's own initiative
    View synonyms