0 If a relationship busts up, or the people in a relationship bust up, the relationship ends:
1 a serious argument, especially one that ends a relationship:
She had a big bust-up with her brother-in-law.
2 a serious argument or disagreement, especially one which ends a relationship:
But you can have difficulties with your brother, sister or cousin, and it does not mean that you have to have a bust-up.
If we had gone on with those annuities there might have been a bankruptcy, or a bust-up.
If there is another bust-up, as so often happens it will be the poor old prison officer who carries the can.
At the end of the day, we shall get the inevitable bust-up.
Therefore, in countless homes there is a bust-up, a terrible row, because those in authority have not known when to relinquish some of it and grant a little more independence.
But it is very much better to have trenchant political criticism and a verbal bust-up in a room in a town hall than a verbal bust-up on the streets.
We had a bust-up over the clause.
There was also a bust-up in the tunnel at half-time.