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general::
Phrase(s): by oneself
1. with no one else present; alone (of two or more people). • Must one sit by oneself or may one join another group? • One just hates eating by oneself, doesn’t one? 2. with the help of no one else. • One is expected to do it by oneself. • Can one do this by oneself ?
McGrawhill's American Idioms And Phrasal Verbs