1 (formal 正式) to order a person to come to a place 召唤: The boys were summoned to the head teacher's office. 那些男孩子被召往校长室。

2 summon sth (up) to find strength, courage or some other quality that you need even though it is difficult to do so 鼓起（力量、勇气等）: She couldn't summon up the courage to leave him. 她没法鼓起勇气离开他。