Consume
In your mouth you put your life on the line by putting in a sword that is big. You put it all the way down there, so you consume it.
Imagine yourself doing a magic trick where you put a big sword in your mouth. You say: "Now, for my next illusion, I will consume a sword!"
きつ
の
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The "consume a sword" illusion came with a cheap magic kit (きつ) you had.
It's odd that there would be a "consume a sword" trick in your magic kit. It seems so real for a kit you can buy at the store.