兔起鹘落（兔起鶻落）　

◎ 兔起鹘落 tùqǐ-húluò

[quick flow of writer‘s thoughts and imagination;as the moment a hare is flushed out the falcon swoops down] 兔一起动,鹘就扑落下来。比喻动作迅速。亦比喻作画、书法、作文等下笔快、无停顿