 Ten more English expressions with the word NO from espressoenglish.net. NO is one of the most common verbs in English, and I know that you know what it means. But what you might not know is that we use this word in many idiomatic expressions, and you're going to learn ten of them today. Number one, for all I know. This expression means, according to the information I currently have, but implies uncertainty, like you don't actually have much information. For example, I'm not eating those mushrooms you found in the woods, they could be poisonous for all I know. Number two, know your stuff. If a person knows their stuff, it means they are very knowledgeable and skilled in that area. For example, this carpenter really knows his stuff because he has 30 years of experience. Number three, know the drill. This means to be familiar with a standard procedure or what is supposed to be done. For example, Nicole has organized the past three conferences, so she knows the drill. Number four, know where you stand. This means to be aware of your current position or situation. For example, I know where I stand and I'm not authorized to make that decision without consulting the director. Number five, it takes one to know one. This phrase is used to insult someone by saying that they are the same as the other person who they are criticizing, accusing or complaining about. For example, Bob says that John is a hypocrite but it takes one to know one. This means I think Bob is also a hypocrite. Number six, you don't know the half of it. This expression means that someone only knows about a small part of a situation but there is a much bigger issue that they are not aware of. For example, I heard you've been a bit busy with work these days. Oh, you don't know the half of it. Not only have I been working 60 hour weeks but also my kids got sick and the house needed some repairs. Number seven, not know what hit someone. If someone doesn't know what hit them, it means they are very surprised and shocked by an unexpected event that has a big negative impact on them. For example, when my wife left me for no reason, I didn't know what hit me. I'd been under the impression that our relationship was fine. Number eight, know no bounds. This expression describes something that is or seems to be without limit. For example, she's always coming up with new ideas. Her creativity knows no bounds. Number nine, what does he or she know? This question is used to say that someone does not know anything about a particular topic. For example, I wish my brother would stop giving me parenting advice. What does he know? He doesn't even have kids. Number ten, who knows? This expression is used when nobody probably knows the answer. For example, how long is this flight going to be delayed? Who knows? I guess it depends on how long it keeps raining. If you would like to learn more English idioms, click on the link in the video or in the description for more information about my English idioms course, which will help you discover, learn and practice idiomatic expressions. By the end of the course, you will have learned 260 common idioms used in everyday spoken English.