noun
leaving something out; leaving something on
Describes the state of having taken something out or turned something on and then leaving it that way, often with a nuance of carelessness or neglect. Commonly used as 出しっぱなしにする or 出しっぱなしだ.
おもちゃを出しっぱなしにしないで片付けなさい。
Don't leave your toys out; put them away.
本を出しっぱなしで寝てしまった。
I fell asleep with the book left out.
A suffix meaning 'leaving something in a state'; 出しっぱなし is a specific noun form using this suffix with 出す.
An older or more literary variant with the same meaning, using the kanji 放.
Compound of 出し (continuative form of 出す 'to take out') + っぱなし (suffix meaning 'leaving as is').