'to stand in' means to replace or represent someone for a short time.
- I'll ask one of my colleagues to stand in while I'm away.
- Another actor stood in for him while he was ill.
'to stand out' means to be much better than similar things or people.
- One person stands out from all the candidates that we have met.
- There is one solution that stands out clearly as the best.
'to stand out' also means to be noticeable because they are very different from others.
- With her height and red hair, she always stands out in a crowd.
- Children never want to stand out but to be just like everyone else.
'to stand over' means to supervise closely, watch what someone is doing.
- She stood over me while I did the work just to be sure that I had done it properly.
- I had to stand over my children otherwise they didn't do their homework.
'to stand round' means to spend time standing, waiting for someone or something or doing nothing.
- They just stood round and watched. They didn't help.
- We stood round in the cold for half an hour waiting for them to arrive.
'to stand up' means to rise into a standing position.
- At school, we had to stand up whenever a teacher entered the room.
- When she came in the room, everyone stood up to greet her.
'to stand someone up' means to fail to meet them on purpose, usually for a romantic date.
- He didn't come. He stood me up!
- I waited in the restaurant for an hour before I realised I'd been stood up.
'to stand up for' something means to defend it because you believe in it.
- You have to stand up for what you believe in.
- You have to stand up for yourself, no one else will.
'to stand up to' means to not give in to someone in a powerful position, to argue your case
- He was never afraid to stand up to his father even when he was very small.
- The management is too weak to stand up to the union and their demands.