Definition of «sad face»

The phrase "sad face" is used to describe someone portraying a sad or unhappy expression.

They're way healthier than French fries (insert sad face emoji here). (babygaga.com)
I know it's a little wrong, but I think my kids have the cutest sad faces on the planet. (rookiemoms.com)
So, the fishermen had to return home with sad faces and empty pockets. (religion-online.org)
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