だっせん 脱線 Common word JLPT N2 Wanikani level 22 Play audio LinksSentence search for 脱線Sentence search for だっせんKanji details for 脱 and 線Edit in JMdict Noun, Suru verb, Intransitive verb1. derailmentNoun, Suru verb, Intransitive verb2. digression; deviation Discussions Log in to talk about this word.