big bang noun
Learner's definition of BIG BANG
the big bang
: a huge explosion that might have happened when the universe began创世大爆炸（宇宙可能由此形成） ◊ The scientific theory that the universe began with a huge explosion is called the big bang theory.科学界关于宇宙因大爆炸而产生的理论被称为大爆炸理论。