1The act of going in and out — people or things entering and exiting a place.
この建物は出入りが自由です。
People are free to enter and exit this building.
深夜に不審な出入りがあったので、警備員が確認した。
There was suspicious coming and going late at night, so the security guard checked it out.
出入り口はあちらの扉です。
The entrance/exit is that door over there.
2Frequenting a place, or having regular dealings/contact with someone.
彼はあの喫茶店に出入りしている常連だ。
He is a regular who frequents that café.
その業者は昔からこの家に出入りしている。
That contractor has been coming and going at this house for a long time.
作家は出版社に頻繁に出入りしている。
The writer frequently visits the publishing company.
3Income and expenditure — money coming in and going out, especially in accounting.
家計の出入りを毎月記録している。
I record the household's income and expenditure every month.
今月は出入りが赤字だ。
This month's balance of income and expenditure is in the red.
会社の出入りは帳簿に正確に記録する必要がある。
The company's cash inflows and outflows need to be recorded accurately in the books.
4An increase and decrease, or fluctuation — a change where an amount goes up and down.
この店は季節によって客の出入りが大きく変わる。
This shop's customer traffic fluctuates greatly depending on the season.
為替相場の出入りが激しく、企業の資金繰りに影響が出た。
Sharp fluctuations in the exchange rate affected companies' cash flow.
5A fight, quarrel, or dispute — an old-fashioned term, sometimes used for a scuffle between rival gangs.
その町では昔、二つの組の出入りがあったという。
They say there was once a skirmish between two gangs in that town.
6Indentations, such as inlets or bays — the jagged, concave-and-convex parts of a coastline (a specialized usage).
この海岸は出入りが多くて船の停泊に適している。
This coastline has many inlets and is well suited for boats to anchor.