to order someone to come to or be present at a particular place, or to officially arrange a meeting of people

General Rattigan summoned reinforcements to help resist the attack. 拉蒂根将军命令增援部队协助抵挡进攻。

On 20 July, the town council was summoned to hear an emergency report on its finances. 7月20日，镇政务委员会被召集起来听取有关其财务问题的紧急报告。

We were summoned to the headmaster's office. 我们被叫去了校长办公室。

to increase your courage or strength, especially with an effort

It took me six months to summon (up) the courage to ask him out for a drink. 我花了6个月时间才鼓起勇气约他出去喝一杯。