She tried to 'put on/up a brave face/front' [=she tried to appear brave or calm] despite the pain of the injury.
The company was slow to enter the 'brave new world' of computer technology.
I had to 'brave the elements' [=go out in bad weather] to get to work.
(..) - Hey. - Hey. We're here to liberate the city and bring Shen to justice. - You will need help. - Thank you, brave sheep, but it's too dangerous. I can't let you. Oh, no, not me. It's not safe to speak here. Right. I'm talking about Masters Ox and Croc. (..)2011 Kung Fu Panda 2