当头

1. right overhead; right on sb.'s head; head on

♦ 烈日~照。 The hot sun is shining right overhead.

♦ 给他~一瓢冷水 pour cold water on him

2. facing (or confronting) one; imminent

♦ 那时候正是国难~, 爱国青年都纷纷到抗敌前线去。 The country was in imminent danger, and large numbers of patriotic young people left for the front to fight the enemy.