C2 an occasion when someone goes into a place or situation where they are not wanted or expected to be闯入,侵扰
They complained about excessive government intrusion (= unwanted involvement) into their legitimate activities.他们抱怨政府过多地侵扰他们的合法活动。
His phone call was a welcome intrusion into an otherwise tedious morning.他突然来电一点也不令人反感,假若没有这个电话,整个上午会很沉闷。