paka-paka
A lid, cover, or flap that keeps opening and will not stay closed — a broken phone case, a loose container lid, or a mailbox that won't latch.
💡A phone case that won't stay closed — 'The case keeps going paka-paka.'
スマホケースの蓋がぱかぱかして閉まらない。
The phone case lid keeps going paka-paka and won't close.
The phone case lid keeps going ___ and won't close.
スマホケースの蓋が○○して閉まらない。