If an open sell position, the stock will go for an auction and the final amount settlement will be done on T+2 day. Till the auction settlement is done, we will keep your balance on hold against the order value. 
If you have an open buy position, the stock will be temporarily delivered. We will then check your Groww Balance. 
If you do not have adequate money in your Groww Balance in the next 1 trading day (T+1 day), we will sell the stock on your behalf as a risk measure. Alternately, you can also sell your position on the next trading day.