to push in; to force into; to break in (e.g. into a house); to intrude
強盗がコンビニに押し入った。
A burglar broke into the convenience store.
山賊が商人の家に押し入って物を盗んだ。
Bandits broke into the merchant's house and stole things.
泥棒は昼間でも無施錠のアパートに押し入る。
Thieves break into unlocked apartments even in broad daylight.