I need a colloquial expression (not a term) that can be used when someone indirectly says something annoying to provoke someone standing next to them.
For example, me and Hannah fought angrily and stopped talking. The next day we met in a gathering. I was standing with someone else and Hannah was next to me, then I say something rude or malicious about Hannah to that person so that I provoke her, knowing that she is standing next to me.
There are various phrases for this: "catty remark", "snide aspersion", "barbed remark", "subtle dig", etc. None of these indicate the other person is in earshot, but you can include that information in the sentence:
While talking to her friend, Dana snidely insulted Hanna's character, after making sure Hanna was close enough to overhear.
I don't think there's a colloquial expression that exactly captures the situation you described in the comments.
I understand that to be:
Person A is angry at Person B. Person A starts saying bad things about Person B to Person C, with the intention of provoking them.
The closest thing I can think of is that we'd call something like that
Passive-aggressive behavior
Whereby you are not directly attacking a person, but doing things to intentionally upset them. It covers a broad variety of behaviors, not just this. For example, if I were upset with a work colleague, and I ignore their requests for important work documents. I am not doing anything to them, but my passive behavior is aggressively hurting them.
So in your example, I would say that you were
"Being passive-aggressive to Hannah"
