俗语 (sú yǔ): common saying; proverb; colloquial speech

Grandma never went to school, but when it comes to common sayings about weather and farming, she knows them one after another—even the old farmers in the village admire her.

That article quoted a northern common saying. Although I recognized every character, I had no idea what it meant behind the words, so I had to look it up.

The teacher told us that using one or two common sayings appropriately in an essay can make it more vivid, but using too many actually makes it seem vulgar.

While chatting with my Chinese friend, he casually said a common saying. I was completely confused, and he explained it for ages before I finally understood.