This is the 7495th most frequent Japanese word.
入りびたっ
"入りびたっ" (iribitta) typically refers to staying or hanging around somewhere habitually or for an extended time, often implying idleness.
The term '入りびたっ' is used here to express spending a lot of time at the library, implying a frequent and relaxed presence.
彼女はよく図書館に入りびたっている。
She often hangs out in the library.
'入りびたっ' in this sentence shows frequent visits to the bar, indicating a habitual action.
彼は毎晩バーに入りびたっている。
He spends every evening at the bar.
Here, '入りびたっ' suggests the children are continuously present and involved at the park, emphasizing engagement.