I'm on his side with this one vs I'm in his side with this one

The correct phrase is "I'm on his side with this one." The preposition "on" is used to indicate support or alignment with someone or something. Using "in" instead of "on" in this context is incorrect and sounds unnatural.

Explained by Jennifer
Editor at TextRanch

Last updated: March 16, 2025 • 5363 views

This phrase is correct and commonly used in English to express support or alignment with someone or something.

"I'm on his side with this one"

This phrase is used to indicate that you support or agree with someone or something in a particular situation.

Show examples from the web [+]

I just kept looking at him, thinking that could be me on his side of the table one day.
I swear I'm on your side on this one.
I'm telling you, man, Green's on our side on this one.
I'm just grateful to have you by my side on this one.
Ghost thinks I'm on his side now.
He doesn't exactly think I'm on his side.
Look, I'm sure your heart's in the right place, but your team's on the wrong side of this one.
I'm on his side, remember?
Bond thinks I'm on his side, so he won't expect anything.
Bond thinks I'm on his side, so he won't expect anything.
So I have to make him believe I'm on his side.
We are on the same side with this one.
Somebody at his side with one foot in the Executive Branch and one in the Legislative.
I'm receiving one side only.
Luckily, he believes I'm on his side, which is exactly what I want him to think.
Not on his side, I'm sure!
I'm more on his side than off his side.
I am on the mayor's side on this one.
I feel like I'm tilting to one side.
I'm thinking Jane weighted it on one side So that it always lands heads.

This phrase is incorrect in English. The preposition "in" is not used to express support or alignment with someone or something.

"I'm in his side with this one"

Show examples from the web [+]

Finley has been a thorn in his side since day one, but if he'd wanted him dead, he'd have done it by now.
I swear I'm on your side on this one.
I'm telling you, man, Green's on our side on this one.
I'm just grateful to have you by my side on this one.
Look, I'm sure your heart's in the right place, but your team's on the wrong side of this one.
We are on the same side with this one.
Somebody at his side with one foot in the Executive Branch and one in the Legislative.
I'm receiving one side only.
I just kept looking at him, thinking that could be me on his side of the table one day.
I am on the mayor's side on this one.
I feel like I'm tilting to one side.
I'm thinking Jane weighted it on one side So that it always lands heads.
Now in order to get back the brother I love, I have no choice but to side with the one I cannot trust.
I'm standing on one side of the bed and I'm going to run to the other.
But I didn't know that would mean that I'm on no one's side.
I'm Danny Donald from the Lower East Side for New York One.
Competition... no one this side of Portland is doing what I'm doing.
After six months of part-time doctoring, as long as I can get back to my full schedule, that is one side effect I'm willing to live with.
I'm sure you walk to work on one side of the street and walk home on the other.
All tablets are marked on one side with a number denoting the tablet strength.

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I'm on his side with this one vs I'm in his side with this one

"I'm on his side with this one"

"I'm in his side with this one"

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