lower one's guard

Verb

 * 1) To become less guarded; to allow oneself to become more vulnerable.

Translations

 * Chinese:
 * Mandarin: 麻痺大意
 * Danish:
 * Dutch:
 * Finnish: herpaantua
 * French:
 * Italian:
 * Polish: usypiać czujność, uśpić czujność
 * Spanish: bajar la guardia