召す (mesu) is the honorific replacement for almost everything a noble person does. Summon someone? 召す. Wear clothes? 召す. Eat, drink, bathe, buy, ride, catch a cold, grow old? All 召す. Even ritual suicide: 腹を召す (hara wo mesu). The most polite way to describe the most violent act. The kanji 召 shows a mouth (口) calling out while a curved hand (刀) beckons. In ancient China, 招 was beckoning with your hand, 召 was summoning with your voice. Both demand attention, but differently.