under own steam
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Related to under own steam: under one's own steam
under (one's) own steam
On one's own; with no assistance from anyone else. Look, mom, I can finish this book report on my own, OK? I don't need you hovering over me correcting my spelling!
under one's own steam
Fig. by one's own power or effort. I missed my ride to class, so I had to get there under my own steam. John will need some help with this project. He can't do it under his own steam.