This question - What did Madara mean by "showing our guts"? - is a question asking about the definition of an english phrase.
Sure, it was found in a manga, but apart from that, it's not really to do with Anime & Manga - just like questions about Japanese that are not relevant to the plot (e.g. https://anime.stackexchange.com/questions/4111/what-is-the-japanese-symbol-on-the-wall-in-episode-83-of-hunter-x-hunter)
I don't see why questions about English would not fall under the same rules?
This is because the scope of the question was worded to ask about what it meant in context with the anime. So therefore it's on-topic. Though it is a question about the English language, it's more so about the context of the situation in anime, therefore it is on-topic here. If what was simply asked was simply "What does the expression 'show me you guts' mean?" without the Naruto anime as context, it might be on-topic for ELL. A good answer to this question would tie the context into it's answer.
The only reason the HxH question was labeled as off-topic, was because it only asked for what the kanji meant in Japanese, rather than why Netero you see this kanji associated with him, in addition to what it meant.
