adverb taking the 'to' particle, adverb
with a flash; brightly; dazzlingly
Onomatopoeic adverb describing a single, brief flash or sparkle of light. Often used with と (ぴかりと). Compare ピカッと for a sharper, more abrupt flash.
See also: ピカッと
A star twinkled brightly.
The camera flash went off with a flash.
Onomatopoeic word mimicking a brief flash or sparkle of light. The exact origin is uncertain, but it is related to the mimetic root ピカ (pika), which represents light or brilliance.