burst in
1．break in；smash in 闯入；破门而入
The police burst in and told everyone to stand still．警察闯了进来，叫大家站着不动。
They had to burst the door in because they had lost the key．他们丢了钥匙，只好破门而入。
2．interrupt 打断
Father told his son not to burst in while adults are talking．父亲叫他儿子不要打断大人的谈话。
3．appear suddenly 突然出现
He'll be bursting in upon us at any moment．他会随时突然出现在我们面前。
We were talking about him when he burst in．我们正谈到他时，他突然来了。