noun
leaving something out; leaving something as is
Describes the state of having left something somewhere without putting it away, often with a nuance of neglect or carelessness. Commonly used as a noun or in adverbial form 置きっぱなしで.
本を机の上に置きっぱなしにしないでください。
Please don't leave books lying on the desk.
おもちゃが置きっぱなしで片付けられていない。
The toys have been left out and not put away.
A suffix meaning 'leaving something in a state' or 'doing something continuously without stopping'. 置きっぱなし is a specific noun form derived from 置く + っぱなし.
A more formal noun meaning 'leaving something unattended' or 'neglect'. 置きっぱなし is more colloquial and often implies a messy or careless state.
Compound of the verb stem 置き (from 置く, 'to put') and the suffix っぱなし, which indicates leaving something in a state or continuing an action. The suffix likely derives from the verb 放す (はなす, 'to release') or its classical form.