sounding continuously; ringing nonstop
Describes a phone, alarm, buzzer, etc. that keeps sounding without stopping. Often implies annoyance or that it has been left unattended.
The phone has been ringing nonstop since morning.
The alarm clock kept ringing and was annoying.
Rare variant using the kanji 放.
Compound of the continuative form 鳴り (from 鳴る 'to sound') + っぱなし (suffix meaning 'leaving something in a state').