cheek by jowl 紧紧靠着、形影不离。

Means: Side by side; close together.
（和…）紧紧靠着，（和…）非常亲昵

If you say that people or things are cheek by jowl with each other, you are indicating that they are very close to each other.

来源：这个短语最早从莎士比亚的《仲夏夜之梦》里来，当时叫"cheek by cheek"。两个世纪之后才出现了"cheek by jowl"这种说法。"Cheek"和"jowl"都是脸颊的意思。想想，两个人的脸颊都贴到一起了，还有比这更亲密的吗？所以下次要表达和谁形影不离就可以用到了！

请看例句：

1. My house stands cheek by jowl with a department store.
我家紧靠一家百货商店。

2. We see the union leaders cheek by jowl with the capitalists.
我们看到工会领导人和资本家们打得火热。

3. I thought that Jenny and Leo had a fight, but I saw them today in the cinema, cheek by jowl.
我原以为Jenny和Leo吵架了，但是我今天在电影院里看见他们挺亲密的。