An upset stomach

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Hubby had an upset stomach and Ananya overheard him saying, ” Dont make anything spicy today…I  have an upset stomach..”

After about an hour, while I was in the kitchen, Anan comes and says, “Amma, I know the spelling of upset…”

Me: Ok..Tell me.

Anan: U .P. S.E.T

Me: Correct…

Anan: Amma, how can the stomach go up and set itself there?