Definition (关心)
This phrase is used to express that the speaker has no interest or concern about what someone else is doing.
我一点都不在意
If he wants to sell his car, for all I care.
如果他想卖掉他的车，我才不在乎。
She can go ahead with her plans, for all I care.
她可以继续她的计划，我才不在乎。
They can argue all night for all I care.
他们可以整晚争吵，我才不在乎。