What does " on one's own steam" mean?
I saw this sentence in a novel. I looked it up in the dictionary but there is no such a phrase.
The full sentence in the novel is "I went outside on my own steam and walked to my car."
Thanks for the help.

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It's a very weird, poetic phrase, that's for sure. I'd rephrase it as "without anyone else's help".

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It means with his own power, his own strength.

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