If you pretend to know what you don't know, you'll only make a fool of yourself.

不懂装懂就会闹笑话。

《新英汉大辞典》

If you go to the wedding in this dress, you'll make a fool of yourself.

你要是穿这身去参加婚礼，你会出丑的。（每日一句11-21）

youdao

Previously, she sings worse than me, I call her just to let her make a fool of yourself.

以前，她唱的比我难听，我叫她只是为了让她出出丑。

youdao

I am told that it plays on a slang phrase then current, "to make a gazebo of yourself," meaning"to make a spectacle of yourself and a fool of yourself, publicly."

有人告诉我这是当时的说法,建筑楼台意思是“,当众出丑,大庭广众下出洋相“

耶鲁公开课 - 现代诗歌课程节选

You can fail to engage the crowd, you can make a fool of yourself, you can attempt too little or too much and miss the mark.

FORBES: Public Speaking Is Risky Business

There are, you know, in a normal political society, you can make forecasts and predictions and, you know, go on Sunday morning shows and make a fool of yourself, but sometimes you can be right because people talk and debate, and there's real politics.

NPR: Looking Into Putin's Soul Again

Nintendo's already dipped its toes into motion-sensing handheld gaming with the gyro-equipped WarioWare: Twisted for the Game Boy Advance, but it looks like the company looks has even grander plans to let you make a fool of yourself in public, at least if a recent patent application is any indication.

ENGADGET: Nintendo patent application reveals plans for motion-sensing handheld