1 [C,U] something that you say that shows your opinions or feelings 表示；表达: Freedom of expression is a basic human right. 言论自由是基本人权。an expression of gratitude/sympathy/anger 表示感激／同情／愤怒的话

2 [C] the look on a person's face that shows what he/she is thinking or feeling 表情；神色: He had a puzzled expression on his face. 他脸上显出疑惑的神色。

3 [C] a word or phrase with a particular meaning 词；词语: ‘I'm starving’ is an expression meaning ‘I'm very hungry’. I'm starving 这句话的意思是 I'm very hungry。a slang/an idiomatic expression 俚语；习语