ばったり
ばったり · battari · JLPT N3 · noun
opportunity
Mimetic thud: batt-ari! You bump right into someone you know
ばったり is a Japanese sound-symbolic word for something sudden and abrupt, like a thud or a dead stop. With 会う it means running into someone unexpectedly: ばったり会った, I bumped into them. The sound fits: two people stopping dead, batt!