The verb summon has 4 senses (first 2 from tagged texts)
1. (8) summon, summons, cite -- (call in an official matter, such as to attend court)
2. (2) summon -- (ask to come; "summon a lawyer")
3. muster, rally, summon, come up, muster up -- (gather or bring together; "muster the courage to do something"; "she rallied her intellect"; "Summon all your courage")
4. mobilize, mobilise, marshal, summon -- (make ready for action or use; "marshal resources")