English Slang collection：
bust up
[释] beat up;
[例] Jimmy was busted up by the bouncers when he got drunk and started messing around.;
busy work
[释] work which keeps people busy, but is not necessary at all;
[例] We learnt nothing in today's class but kept doing busy work.
butt crack of dawn
[释] early morning;
[例] I gotta get up at the butt-crack of dawn to pick up Joe at the airport.;
butt dial
[释] to accidentally call sb on a cellphone in one's pocket;[例] He knew our plan for his B-day because my cell butt dial him.
butter face
[释] a woman with an attractive body, but no good looking face;
[例] My blind date last night was a total butter face.;
butterfly effect
[释] the scientific theory that a single occurrence, can change the course of the universe forever.
编辑推荐：
新东方雅思培训辅导班
雅思辅导
