召 summon

When you summon a demon, you yell, "SHOW yourself!!!"

I will raise my sword and open my mouth to summon the troops: "Chaaaarggeee!!"

let's eat ★★☆☆☆ F
召 (summon) + 上 (above) = 召し上がる (let's eat)

Very polite way to say, "let's eat" to a superior person. This sounds like you don't need it, but when you go to a restaurant, YOU, believe it or not, are a superior person, and so you'll need to know this word to understand what the waiter is saying to you.