To force a smile or pretend to be happy despite feeling sad, distressed, or upset.
尽管她心里很难过，但在朋友面前，她还是强颜为笑，不想让他们担心。
Although she was very sad inside, she still forced a smile in front of her friends, not wanting them to worry.
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To force a smile or pretend to be happy despite feeling sad, distressed, or upset.