So you’re in an American bar.
It’s loud, but you can make out what people are saying.
You hear a fellow drinker talking about hitting books…
…another is talking about twisting someone’s arm…
…and it sounds like someone’s been stabbed in the back.
What the heck is going on?
You scratch your head and wonder why you’re still lost even though you can translate the words.
Well, you’ve just had your first introduction to English idioms.