Definition (關心)
This phrase is used to express that the speaker has no interest or concern about what someone else is doing.
我一點都不在意
If he wants to sell his car, for all I care.
如果他想賣掉他的車，我才不在乎。
She can go ahead with her plans, for all I care.
她可以繼續她的計劃，我才不在乎。
They can argue all night for all I care.
他們可以整晚爭吵，我才不在乎。