I've been stood up!

I'm on standby

I'm a stand-in

I know where I stand

I'm making a stand against it

I want to stand up and be counted

I'm standing on my own two feet

I'm standing my ground

The girl/boy I had a date with didn't turn up

I have been asked to be available for work at short notice

I'm ready to take someone's place in case of necessity or emergency

I am aware of my precise status or position

I'm making a determined effort to defend something or to stop it happening

I want people to know my opinions, whatever the result

I'm being independent and not receiving support from anyone

However hard people try, I'm refusing to change my stance