expression, godan verb (-ru)
don't lie down right after eating (or you'll turn into a cow)
A humorous proverb warning against lying down immediately after a meal, often used to scold children or in a lighthearted manner. The literal meaning is 'if you lie down soon after eating, you will become a cow.'
「食べてすぐ寝ると牛になるよ」と母が子供に言った。
"If you lie down right after eating, you'll turn into a cow," the mother told her child.
食べてすぐ寝ると牛になるって聞いたことある？
Have you ever heard the saying that if you lie down right after eating, you'll become a cow?