You can look up the entire phrase or just ask someone. There’s no need to know where it came from, although it might make retention easier, or comprehension bet

You can look up the entire phrase or just ask someone. There’s no need to know where it came from, although it might make retention easier, or comprehension better. Nothing beats time spent immersed in the language and just asking questions or looking at context when something seems odd. Living languages aren’t static targets either, you’ll sound formal or just plain strange if you elevate dictionary definitions over experience and practice with common usage.