What can I do when I'm really angry at someone but can't immediately leave the situation?

I usually take a deep breath and realize that they are probable dealing with stuff too. If I am still angry after a little while, I try my best to try and escuse myself even if for a short while. for example, going to get water or use the bathroom.

You can take your breath and sort your thoughts. You can communicate how you feel , in a calm way. And always remember your breath

Get yourself together. Don't make it obvious until you get out of the situation. I know it's hard when you're really angry, but that's all you gotta do. Be silent because when you're really angry, you might say the wrong words when you speak.

This may sound cheesy, but closing your eyes and very slowly counting to 10 whilst taking deep breaths can help with calming down.

This is extremely tough for most people. The best thing you can do if you PHYSICALLY cannot leave is to take a long breath. Count to five. (Seriously.) Keep your voice calm and low, and express what is making you angry. Don't escalate the situation. Imagine the argument is a fire. The louder you get, the more you curse, the less diplomatic you are-- you are throwing wood on the fire. If you keep your voice low and calm, and avoid making accusations, simply EXPRESS why you are upset, the fire will die down naturally.

Deep breathing is always an option. This works for me, so it's worth a try, but I always focus inwards. Not at my emotions, but actual physical things. Feeling my toes wiggle, my fingers wiggle. Focusing on the weight of myself in my chair, or my feet if standing. Sometimes deep breathing is hard for me until I try these things, it sort of removes myself from the situation without doing so physically, giving me time to cool it a little.

Take my time with them and be patient and not let the anger build up inside of me and not let it out there and then.

Think is causing scene worth it. There is a place and time for everything. If you think its not worth the reaction don't bother doing it. Wait till you have your private space to vent.

it is a tough situation when you angry and even more tougher when you can't leave , the golden rule i follow is to not speak when you are angry , drink a glass of water slowly , keep yourself occupied and don't speak , don't react , you will be glad afterwards

Breathe deeply and remember they are not worth all of your negative energy. Giving them people the time of day is what they want if you think they are intentionally doing so, if you think you can control your anger, have a calm chat with them about how they have made you feel.