1.people who are thick as thieves are very friendly with each other and spend a lot of time together talking about private things
1.a close friend; the bartender was chummy with the regular customers; the two were thick as thieves for months.
亲密的朋友；这个酒吧招待对常客很亲密；他们两个亲密了几个月。
2.I see you two all the time , you're thick as thieves , you are ! He must'a said something !
我知道你俩天天在一起，亲密无比，狼狈为奸！他一定说了什么！
3.We are brothers as thick as thieves.
我们手足情深亲密无间。