Examples:

• Then I was going to say keep a stiff upper lip.
• There's only one thing to do, Bertha... keep a stiff upper lip.
• Now, now, my dear, keep a stiff upper lip.
• The generation who fought the war had to keep a stiff upper lip and weather the storm.
• Joe was a good salesman. If he went through a bad patch, he'd say to himself, "Keep a stiff upper lip and weather the storm."