よぼうせん 予防線 LinksSentence search for 予防線Sentence search for よぼうせんKanji details for 予, 防 and 線Edit in JMdict Noun1. defensive perimeter; defence line; defense line; defensive measuresNoun2. precaution; safeguard; safety measureSee also 予防線を張る, usu. as 予防線を張る Discussions Log in to talk about this word.