on one's side

/ˌɒn wˈɒnz sˈaɪd/

/ˌɑːn wˈʌnz sˈaɪd/

on one's side

agreeing with someone or supporting them in an argument, plan, etc.

used for saying that something is advantageous to one as it makes achieving success much easier

Examples

1. I usually sleep on my side, but some people prefer sleeping on their back.

2. Rick seems to have had luck on his side during his 12-year acting career.

3. Physics was on his side.

4. 'I want the Egyptian people to know that we are on their side, and that we want their country to be strong and safe.