on one's side

“If one doesn’t have truth on one’s side, shouting loudly with emotion can certainly work.”

It’s not about secret documents, per se; it’s about having the facts on one’s side.

“But we are keen to encourage the message that sleeping on one’s side is a way to optimize the baby’s health, both in reducing stillbirth and optimizing the baby’s growth.”

Clamshells — lying on one’s side with legs bent, and raising and lowering the top leg — are the simplest and easiest way to strengthen the gluteus medius.

“Which, it turns out, is not a great way to get the public on one’s side.”