1.  going in and out;  entering and exiting
Adjective (の)
Noun
Verb (する)
2.  visiting regularly;  frequenting;  having regular dealings with
3.  income and expenditure;  incomings and outgoings
4.  increase and decrease;  surplus and deficit;  fluctuation
5.  fight;  trouble;  quarrel;  dispute
6.  indentations (e.g. of a coastline)