mount a mount?

So I'm fairly new to using linux and I would like to know if its possible to mount something I mounted..
Example:
I have /mnt/bla and I want to mount that to /app/dir

Is this even possible? and ifso how?

Also I forgot to add that I read about recursive mounting being dangerous since it can create loops with programs going through the dirtree

Nevermind, I did some more research and mount --bind seems to be what I'm looking for..

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