(all) by one's lonesome
idiom
informal
: without anyone else : entirely alone
He sat by his lonesome at the dinner table.
She made the cake all by her lonesome.
Cite this Entry
“(all) by one's lonesome.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28all%29%20by%20one%27s%20lonesome. Accessed 31 Oct. 2025.
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