Facing increasing pressure, the prime minister announced he would abdicate his position.

abdicate 是动词，由前缀 ab-（表示"离开、脱离"）和词根 dic（表示"说、宣布"）加上动词后缀 -ate 组成，字面意思是"宣布离开"。这个词特指君主或统治者正式放弃王位或职位，也可以泛指正式辞去重要职务。