There are two very common uses for this figure of speech. 1) It can mean to understand: “It took me awhile to catch on, but now I understand what you mean.” 2) It can mean that something has become popular: “That new song caught on very quickly; everybody is downloading it.” “The new fashions didn’t catch on; not many people bought them.”
明白理解;流行起來
這個片語有兩種含意 第一個含意是”明白;理解”: 這花了好一段時間才明白,現在我已經理解你的意思了。 第二個含意是”流行起來”: 這首新歌紅得非常快,每個人都在下載” “這個新樣式並沒有流行起來,幾乎沒有太多人購買”