Examples:

• You don't have to put on a brave face for us, okay?
• Despite the pain, he put on a brave face.
• Finally, he sighed and put on a brave face.
• You can put on a brave face, but I know you.
• No need to put on a brave face.
• They put on a brave face.
• You'd put on a brave face like always.
• Of course, during that time in the hospital, the most I could do was put on a brave face and pretend that I was neither worried nor scared and try and offer my wife the highest moral support I could.
• They put on a brave face after hearing the bad news.
• Don't lose heart, Bill. Put on a brave face and weather the storm.