What's the difference between "burst" and "explode"?
These two words are very similar. "Burst" is a verb used to describe the action of something breaking suddenly and violently and spilling its contents, usually due to some kind of impact or pressure. "Explode" means the same thing, but there isn't as much emphasis on the spilling of contents as the thing breaks. This is why Sheldon is referring to his stomach troubles as "about to burst," meaning that the contents of his stomach are about to burst out of his behind. He could not have used the word "explode," which would not have described the situation of contents spilling in the same way. Ex: Stop shaking the can of soda! It's about to burst. Ex: The bomb was about to explode.
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