incursion         
noun [ C ] uk/ɪnˈkɜː.ʒən/ us/ɪnˈkɝː.ʒən/
 (尤指跨越边境的)侵入,侵犯
a sudden attack on or act of going into a place, especially across a border
  incursions into enemy territory 攻入敌方领地 
  formal(对他人私生活的)介入,侵犯 
an occasion when people suddenly involve themselves in another person's private situation