causative of intransitive

Japanese can form a causative of an intransitive verb (進ませる from 進む 'advance', 詰まらせる from 詰まる 'choke up', 倒れさせる from 倒れる 'fall') even when a transitive counterpart exists. The two are nearly synonymous in many cases but the causative version subtly emphasizes the agent's role in inducing the change — sometimes rendering in English as accidental causation ('choked on', 'caused [it] to fall', 'let X happen'). Context determines whether the reading is deliberate-causation or accidental-causation.