under your own steam
Meaning: If you do something under your own steam, you do it without anybody's help.
- Don't worry about arranging transport for us. We can get there under our own steam.
- Roger thinks he can get to the top under his own steam and doesn't think he needs a coach to help him.
Origin: Probably related to the fact that trains, ships and machines in general used to be powered by steam. Doing something "under your own steam" would have been the equivalent of doing it under your own power.
Can you get to the concert under you own steam, or would you