Japanese Onomatopoeia Dictionary – All Words | onowords – Japanese Sound Expressions

bara-bara（バラバラ）
Giongo（擬音語）, Gitaigo（擬態語）★★★☆☆Physical Movement / Sound

1. Scattered or separated into pieces

biku-biku（ビクビク）
Gitaigo（擬態語）★★★☆☆Psychological / Emotional

1. Trembling or twitching slightly due to fear or tension