Alcohol is a poison. It may not seem like it but alcohol is a poison and can sometimes have lethal consequences. Your body can only process one unit of alcohol an hour. Drink a lot in a short space of time and the amount of alcohol in the blood can stop the body from working properly.
Definition of expression for English Language Learners. : 1  the act of making your thoughts, feelings, etc., known by speech, writing, or some other method : the act of expressing something. : 2  a word or phrase. : 3  the way someone's face looks that shows emotions and feelings.
Idiomatic expressions are a type of informal English that have a meaning different from the meaning of the words in the expression. Here's an example of an idiomatic expression. Hold your tongue. This idiom does not actually mean that you should stick your fingers in your mouth and grab a hold of your tongue.