brave face, put on a

1. Try to appear brave even though very frightened. For example, Harry was terrified of animals, but his boss was a dog lover, so he put up a brave front . [Second half of 1800s]

2. Face adversity cheerfully. For example, Even though she had been passed over for promotion, she put on a brave face .

Idioms and Phrases

Also, put up a brave front .