on one's side

English edit

Used other than figuratively or idiomatically: see on,‎ side.
He was sleeping on my side of the bed.
- 2021, Michael Farris Smith, chapter 40, in Nick, New York, Boston, London: Little, Brown and Company, page 207:
  She was on her side and the pale light lay draped across the curve of her body.
Supporting or advocating for someone.
No matter what happens, we will always be on your side.
Helping to succeed; acting as an advantage.
Time is not on our side.

supporting someone

helping succeed